Add release docs.

Author: adiroiban

docs/Release.md

@@ -0,0 +1,31 @@
+# Release
+
+GitHub Action is used to build the release files and publish them on PyPi.
+This is automatically triggered when a new tag is created.
+
+## Pre-release steps
+
+* Create a new branch with a name that starts with `release-`.
+  Ex: `release-2.1.0`
+* Update the version inside setup.py
+* Update CHANGELOG.md with the latest version and release date.
+* Create a pull request and make sure all checks pass.
+  The wheels are generated as part of the PR checks,
+  but they are not yet published to PyPI.
+
+
+## Release steps
+
+* Use [GitHub Release](https://github.com/ibm-messaging/mq-mqi-python/releases/new) to create a new release together with a new tag.
+* You don't have to create a GitHub Release, the important part is to
+  create a new tag.
+* The tag value is the version. Without any prefix.
+* Once a tag is pushed to the repo, GitHub Action will re-run all the jobs
+  and will publish to PyPI.
+
+
+## Post-release steps
+
+* Update the version inside setup.py to the next development version.
+  Increment the micro version and add a .dev0 suffix.
+* Merge the pull request