Prepare for publishing

CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome and encouraged! See [/issues][issues] for ideas, or suggest your own!
+If you're thinking to create a PR with large feature/change, please first discuss it in an issue.
+
+## Releases
+
+- Update version in `simconnect-sdk-derive/Cargo.toml`
+- Update version in `simconnect-sdk/Cargo.toml` (crate + `simconnect-sdk-derive`)
+- Update CHANGELOG.md
+- Commit
+- Add tag
+
+  ```bash
+  git tag -a vX.X.X
+  ```
+
+- Push
+
+  ```bash
+  git push --follow-tags
+  ```
+
+- Release\
+  Create a [new release][releases]. \
+  The `publish.yml` GitHub Action will pick it up and do the actual release to [crates.io][crates_io].
+
+[issues]: https://github.com/mihai-dinculescu/simconnect-sdk/issues
+[releases]: https://github.com/mihai-dinculescu/simconnect-sdk/releases
+[crates_io]: https://crates.io