document release process

Author: rursprung

releasing.md

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+# How To Release The Crate
+This guide is only relevant for maintainers.
+
+This crate is set up to be released using [`cargo-release`](https://crates.io/crates/cargo-release),
+please install it and use it to do the release. It also takes care of updating the [changelog](CHANGELOG.md).
+
+To do the release:
+1. Make sure that your local clone of the repository is up-to-date
+2. Switch to a new feature branch for the release
+3. Run `cargo release [level]` (see their documentation for more details) to dry-run it.
+   Make sure to choose the appropriate level based on semantic versioning!
+4. Once you're happy with the result append `--execute`
+5. After the release push the created tag & commit, create a PR & merge it
+6. Create a release on GitHub based on the tag