Release notes for 0.99.1 (#1591)

* Release notes for `0.99.1`

Please add your new features and breaking changes to the release notes
by opening PRs against the `release-notes-0.99.1` branch.

## TODO
- [ ] look at interesting contributions
- [ ] write all the sections
- [ ] order the sections by interest
- [ ] add the breaking changes
- [ ] detail the breaking changes
- [ ] add the full changelog
- [ ] complete all the `TODO`s inside the release note
- [ ] ... (PRs that need to land before the release, e.g. [deprecations](https://github.com/nushell/nushell/labels/deprecation) or [removals](https://github.com/nushell/nushell/pulls?q=is%3Apr+is%3Aopen+label%3Aremoval-after-deprecation))

* 0.99.1 release notes (#1592)

Author: IanManske

blog/2024-10-17-nushell_0_99_1.md

@@ -0,0 +1,23 @@
+---
+title: Nushell 0.99.1
+author: The Nu Authors
+author_site: https://twitter.com/nu_shell
+author_image: https://www.nushell.sh/blog/images/nu_logo.png
+excerpt: Today, we're releasing version 0.99.1 of Nu. This release fixes a bug regarding `$env.LAST_EXIT_CODE`.
+---
+
+# Nushell 0.99.1
+
+Nushell, or Nu for short, is a new shell that takes a modern, structured approach to your command line. It works seamlessly with the data from your filesystem, operating system, and a growing number of file formats to make it easy to build powerful command line pipelines.
+
+Today, we're releasing version 0.99.1 of Nu. This release fixes a bug regarding `$env.LAST_EXIT_CODE`.
+
+# Where to get it
+
+Nu 0.99.1 is available as [pre-built binaries](https://github.com/nushell/nushell/releases/tag/0.99.1) or from [crates.io](https://crates.io/crates/nu). If you have Rust installed you can install it using `cargo install nu`.
+
+As part of this release, we also publish a set of optional plugins you can install and use with Nu. To install, use `cargo install nu_plugin_<plugin name>`.
+
+# Bug fixes and other changes [[toc](#table-of-content)]
+
+A bug was introduced in 0.99.0 where `return`, `break`, and `continue` could cause `$env.LAST_EXIT_CODE` to be set to 1. This has been fixed in [#14120](https://github.com/nushell/nushell/pull/14120).