Add action to automatically tag commits

Using this action: https://github.com/marketplace/actions/github-tag-bump
The idea is that the repo will be versioned in SemVer format, such as "v0.5.3".
When a PR is merged, a new version will automatically be added.
The new version is generated based on the latest tag, and the part that is bumped
is dictated by the merge commit message, either #major, #minor (default) or #patch.

This way I (the repo owner) has control over versioning, and other contributors
don't have to bother with anything.

.github/workflows/bump-version.yml

@@ -0,0 +1,23 @@
+name: Bump version
+on:
+  pull_request:
+    #types:
+    #  - closed
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: '0'
+
+      - name: Bump version and push tag
+        uses: anothrNick/github-tag-action@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          WITH_V: true
+          DRY_RUN: true