add CONTRIBUTING guidelines and initial changelogs

CONTRIBUTING.md

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+# Contributing to parity-common
+
+parity-common welcomes contribution from everyone in the form of suggestions, bug
+reports, pull requests, and feedback. This document gives some guidance if you
+are thinking of helping us.
+
+Please reach out here in a GitHub issue if we can do anything to help you contribute.
+
+## Submitting bug reports and feature requests
+
+When reporting a bug or asking for help, please include enough details so that
+the people helping you can reproduce the behavior you are seeing. For some tips
+on how to approach this, read about how to produce a [Minimal, Complete, and
+Verifiable example].
+
+[Minimal, Complete, and Verifiable example]: https://stackoverflow.com/help/mcve
+
+When making a feature request, please make it clear what problem you intend to
+solve with the feature, any ideas for how parity-common could support solving that problem, any possible alternatives, and any disadvantages.
+
+## Versioning
+
+As many crates in the rust ecosystem, all crates in parity-common follow [semantic versioning]. This means bumping PATCH version on bug fixes that don't break backwards compatibility, MINOR version on new features and MAJOR version otherwise (MAJOR.MINOR.PATCH). Versions < 1.0 are considered to have the format 0.MAJOR.MINOR, which means bumping MINOR version for all non-breaking changes.
+
+If you bump a dependency that publicly exposed in crate's API (e.g. `pub use dependency;` or `pub field: dependency::Dependency`) and the version transition for dependency was semver-breaking, than it is considered to be a breaking change. To put it simply, if you change could cause a compilation error in user's code, it is a breaking change.
+
+## Releasing a new version
+
+When making a new release make sure to follow these steps:
+* Add a git tag in format `<crate-name>-v<version>`, e.g. `impl-serde-v0.2.2`
+* List all major and breaking changes in the crate's changelog.
+* `cargo publish`
+
+[semantic versioning]: https://semver.org/
+
+## Conduct
+
+We follow [Substrate Code of Conduct].
+
+[Substrate Code of Conduct]: https://github.com/paritytech/substrate/blob/master/CODE_OF_CONDUCT.adoc
+
+## Attribution
+
+This guideline is adapted from [Serde's CONTRIBUTING guide].
+
+[Serde's CONTRIBUTING guide]: https://github.com/serde-rs/serde/blob/master/CONTRIBUTING.md

contract-address/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

ethbloom/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.8.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

ethereum-types/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+### Added
+- uint error type is re-exported (https://github.com/paritytech/parity-common/pull/244)

fixed-hash/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.5.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

keccak-hash/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.4.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

kvdb-memorydb/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

kvdb-rocksdb/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.1.6] - 2019-10-24
+- Updated to 2018 edition idioms (https://github.com/paritytech/parity-common/pull/237)
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

kvdb-web/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.1.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

kvdb/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.1.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)
+### Changed
+- Migrated to 2018 edition (https://github.com/paritytech/parity-common/pull/205)

parity-bytes/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog].
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.1.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)
+### Added 
+- Added no-std support (https://github.com/paritytech/parity-common/pull/154)

parity-crypto/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

parity-path/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

parity-util-mem/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.2.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

plain_hasher/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.2.2] - 2019-10-24
+- Migrated to 2018 edition (https://github.com/paritytech/parity-common/pull/213)
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

primitive-types/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.6.1] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

primitive-types/impls/codec/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

primitive-types/impls/rlp/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

primitive-types/impls/serde/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]

rlp/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.4.3] - 2019-10-24
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)
+### Fixed
+- Fixed nested unbounded lists (https://github.com/paritytech/parity-common/pull/203)
+### Added
+- Added no-std support (https://github.com/paritytech/parity-common/pull/206)

trace-time/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.1.2] - 2019-10-24
+- Migrated to 2018 edition (https://github.com/paritytech/parity-common/pull/232)
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

transaction-pool/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [2.0.2] - 2019-10-24
+- Updated to 2018 edition idioms (https://github.com/paritytech/parity-common/pull/237) 
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

triehash/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.8.1] - 2019-10-24
+- Migrated to 2018 edition (https://github.com/paritytech/parity-common/pull/214)
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)

uint/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog]. 
+
+[Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
+
+## [Unreleased]
+
+## [0.8.2] - 2019-10-24
+### Fixed
+- Fixed 2018 edition imports (https://github.com/paritytech/parity-common/pull/237)
+- Removed `uninitialized` usage (https://github.com/paritytech/parity-common/pull/238)
+### Dependencies
+- Updated dependencies (https://github.com/paritytech/parity-common/pull/239)
+### Changed
+- Modified AsRef impl (https://github.com/paritytech/parity-common/pull/196)