📖 add info about release process

Author: camilamacedo86

RELEASE.md

@@ -0,0 +1,47 @@
+# Release Process
+
+The Kubernetes controller-runtime Project is released on an as-needed basis. The process is as follows:
+
+**Note:** Releases are done from the `release-MAJOR.MINOR` branches. For PATCH releases is not required
+to create a new branch you will just need to ensure that all big fixes are cherry-picked into the respective
+`release-MAJOR.MINOR` branch. To know more about versioning check https://semver.org/. 
+
+## How to do a release 
+
+### Create the new branch and the release tag
+
+1. Create a new branch `git checkout -b release-<MAJOR.MINOR>` from master
+2. Push the new branch to the remote repository
+
+### Now, let's generate the changelog
+
+1. Create the changelog from the new branch `release-<MAJOR.MINOR>` (`git checkout release-<MAJOR.MINOR>`). 
+You will need to use the [kubebuilder-release-tools][kubebuilder-release-tools] to generate the notes. See [here][release-notes-generation]
+
+> **Note**
+> - You will need to have checkout locally from the remote repository the previous branch
+> - Also, ensure that you fetch all tags from the remote `git fetch --all --tags`
+
+### Draft a new release from GitHub
+
+1. Create a new tag with the correct version from the new `release-<MAJOR.MINOR>` branch 
+2. Add the changelog on it and publish. Now, the code source is released !
+
+### Add a new Prow test the for the new branch release
+
+1. Create a new prow test under [github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes-sigs/controller-runtime](https://github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes-sigs/controller-runtime) 
+for the new `release-<MAJOR.MINOR>` branch. (i.e. for the `0.11.0` release see the PR: https://github.com/kubernetes/test-infra/pull/25205)
+2. Ping the infra PR in the controller-runtime slack channel for reviews.
+
+### Announce the new release:
+
+1. Publish on the Slack channel the new release, i.e:
+
+````
+:announce: Controller-Runtime v0.12.0 has been released!
+This release includes a Kubernetes dependency bump to v1.24.
+For more info, see the release page: https://github.com/kubernetes-sigs/controller-runtime/releases.
+ :tada:  Thanks to all our contributors!
+````
+
+2. An announcement email is sent to `kubebuilder@googlegroups.com` with the subject `[ANNOUNCE] Controller-Runtime $VERSION is released`