Add release instructions

Signed-off-by: tdruez <[email protected]>

Author: tdruez

RELEASE.md

@@ -0,0 +1,20 @@
+# Release instructions for `DejaCode
+
+### Automated release workflow
+
+- Create a new `release-x.x.x` branch
+- Update the version in:
+  - `setup.cfg`
+  - `dejacode/__init__.py`
+  - `CHANGELOG.rst` (set date)
+- Commit and push this branch
+- Create a PR and merge once approved
+- Tag and push that tag. This will trigger the `create-github-release.yml`
+  and `publish-docker-image.yml` GitHub workflows:
+  ```
+  VERSION=vx.x.x  # <- Set the new version here
+  git tag -a $VERSION -m ""
+  git push origin $VERSION
+  ```
+- Review the GitHub release created by the workflow at 
+  https://github.com/aboutcode-org/dejacode/releases/