Add RELEASING.md (#176)

Add release guide

Signed-off-by: Catherine Chan-Tse <cchantse@redhat.com>

RELEASING.md

@@ -0,0 +1,43 @@
+# Release Guide
+
+These steps describe how to cut a release of the catalogd repo.
+
+## Table of Contents:
+
+- [Major and minor releases](#major-and-minor-releases)
+
+## Major and Minor Releases
+
+Before starting, ensure the milestone is cleaned up. All issues that need to
+get into the release should be closed and any issue that won't make the release
+should be pushed to the next milestone.
+
+These instructions use `v0.Y.0` as the example release. Please ensure to replace
+the version with the correct release being cut. It is also assumed that the upstream
+operator-framework/catalogd repository is the `upstream` remote on your machine.
+
+### Procedure
+
+1. Create a release branch by running the following, assuming the upstream
+operator-framework/catalogd repository is the `upstream` remote on your machine:
+
+   - ```sh
+     git checkout main
+     git fetch upstream
+     git pull upstream main
+     git checkout -b release-v0.Y
+     git push upstream release-v0.Y
+     ```
+
+2. Tag the release:
+
+   - ```sh
+     git tag -am "catalogd v0.Y.0" v0.Y.0
+     git push upstream v0.Y.0
+     ```
+
+3. Check the status of the [release GitHub Action](https://github.com/operator-framework/catalogd/actions/workflows/release.yaml).
+Once it is complete, the new release should appear on the [release page](https://github.com/operator-framework/catalogd/releases).
+
+4. Clean up the GitHub milestone:
+   - In the [GitHub milestone](https://github.com/operator-framework/catalogd/milestones), bump any open issues to the following release and then close out the milestone.