docs: Add release instructions

CONTRIBUTING.md

@@ -9,3 +9,32 @@ start working on a pull request. Additionally, please look at the GitHub actions
 [workflows](https://github.com/ALPHA-g-Experiment/data-handler/tree/main/.github/workflows)
 to find out all the checks that your code has to pass before it can be
 reviewed/merged.
+
+## Release Process
+
+Once you have implemented all the fixes/features you want to release (make sure
+you are on the main branch and it is up-to-date), you need to:
+
+```bash
+# Step 1: Make a new branch
+git switch -c $NEW_BRANCH
+
+# Step 2: Check all commits since the last release
+cargo release changes
+
+# Step 3: Update the `CHANGELOG.md` to include anything relevant that was missed
+# Then commit the changes e.g.
+git commit -am "docs: Update CHANGELOG.md"
+
+# Step 4: Determine what the next version is (according to semver) and give
+# `cargo-release` the pleasure of doing all the boring stuff
+cargo release --execute --no-publish --no-tag --allow-branch=$NEW_BRANCH $NEW_VERSION
+
+# Step 5: Open a pull request and review/merge to `main`
+
+# Step 6: Release from the main branch
+git checkout main
+git pull
+cargo release tag --execute
+cargo release push --execute
+```