docs: add a contributing file [skip ci]

CHANGELOG.md

@@ -17,24 +17,6 @@ Types of changes
 - Security in case of vulnerabilities.
 -->
 
-<!--
-Before releasing update dependencies with:
-
-pushd .
-  cargo update
-  nix flake update
-popd
-pushd front/
-  cargo update
-  nix flake update
-  yarn upgrade
-popd
-pushd integrations/vscode/
-  yarn upgrade
-  yarn2nix > yarn.lock.nix
-popd
--->
-
 ### Added
 
 - A [Style Guide](./STYLE.md), explaining why certain decisions were taken

CONTRIBUTING.md

@@ -0,0 +1,45 @@
+# How to contribute
+
+Note that Alejandra is and has always been
+[public domain software](https://stpeter.im/writings/essays/publicdomain.html).
+Unless explicitly stated by you,
+contributing implies licensing those contributions under the same [license](./UNLICENSE).
+For more information please visit https://unlicense.org/.
+
+# Opening Issues
+
+Feel free to speak your mind :)
+
+# Submitting changes
+
+If your contribution has the potential to be controversial or subjective,
+please open an issue first so that we can discuss it first.
+
+Otherwise just feel free to contribute anything you want
+(if it makes the project _better_).
+
+# Maintainers zone
+
+## Release process
+
+1. Update dependencies with:
+
+   ```sh
+   pushd .
+     cargo update
+     nix flake update
+   popd
+   pushd front/
+     cargo update
+     nix flake update
+     yarn upgrade
+   popd
+   pushd integrations/vscode/
+     yarn upgrade
+     yarn2nix > yarn.lock.nix
+   popd
+   ```
+
+1. Update the [changelog](./CHANGELOG.md).
+1. Tag the project with git.
+1. Publish to crates.io.