Create CONTRIBUTING.md

Author: loning

CONTRIBUTING.md

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+## Contribution Guide
+
+aelf is an [open source](https://github.com/aelfproject) and community driven project. This guide is aims to help anyone wants to contribute to the project.
+
+### Code Contribution
+
+You can always send pull requests to the Github repository.
+
+- Clone the [aelf repository](https://github.com/aelfproject/aelf/) from Github.
+- Make the required changes.
+- Send a pull request.
+
+Before making any change, please discuss it on the [Github issues](https://github.com/aelfproject/aelf/issues). In this way, no other developer will work on the same issue and your PR will have a better chance to be accepted.
+
+#### Bug Fixes & Enhancements
+
+You may want to fix a known bug or work on a planned enhancement. See [the issue list](https://github.com/aelfproject/aelf/issues) on Github.
+
+#### Feature Requests
+
+If you have a feature idea for the framework or modules, [create an issue](https://github.com/aelfproject/aelf/issues/new) on Github or attend to an existing discussion. Then you can implement it if it's embraced by the community.
+
+### Blog Posts & Tutorials
+
+If you decide to create some tutorials or blog posts on aelf, please inform us (by creating a [Github issue](https://github.com/aelfproject/aelf/issues)), so we may add a link to your tutorial/post in the official documentation and we can announce it on our [Twitter account](https://twitter.com/aelfblockchain).
+
+### Bug Report
+
+If you find any bug, please [create an issue on the Github repository](https://github.com/aelfproject/aelf/issues/new).
+
+### Thanks
+
+Thanks to ABP, we follow their contribute guides