Start to document the release process (#234)

Author: davidcollom

docs/release.md

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+# Release Process
+
+Github Actions is the primary release tool, most of the heavy lifting is done in the following workflow: `.github/workflows/release.yaml`
+
+## Starting the process
+
+To start a new release, we first need to create a branch using the following convention: `release-vX.Y.Z`
+
+Once this branch has been created, GitHub actions will update all relevant version numbers to the appropriate branch version.
+
+This will then raise a PR for review.
+
+Once reviewed and approved, a contributor must checkout `main` and tag the `main` branch with the relevant tag from the branch/PR.
+
+This will trigger the full release workflow and push container images and create the GitHub release too.