Added major release number workflow

Author: cicirello

.github/workflows/major-release-num.yml

@@ -0,0 +1,23 @@
+name: Move Major Release Tag
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  movetag:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Get major version num and update tag
+      run: |
+        VERSION=${GITHUB_REF#refs/tags/}
+        MAJOR=${VERSION%%.*}
+        git config --global user.name 'YOUR NAME GOES HERE'
+        git config --global user.email 'USERNAME@users.noreply.github.com'
+        git tag -fa ${MAJOR} -m "Update major version tag"
+        git push origin ${MAJOR} --force
+
+        

README.md

@@ -101,4 +101,10 @@ executes the tests in `tests/integration.py` (see earlier section) to validate
 any files created or edited by the integration test. You might also add a step
 to the workflow to test that outputs are correct as well. 
 
+### .github/workflows/major-release-num.yml
 
+This workflow maintains a major release tag (e.g., v1 if current release 
+is v1.x.y). It runs on each release and either creates the tag (if this is the
+first release of a new major release number) or moves it if this is a minor
+or patch level release. __IMPORTANT: You must edit this with your name, etc in
+the commit and push step.__