Add code to handle github action

.github/workflows/main.yml

@@ -0,0 +1,24 @@
+name: Gulp build and commit updated stylesheets
+
+on:
+  push:
+    branches: [master, Develop]
+  pull_request:
+    branches: [master, Develop]
+
+jobs:
+  gulp-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.ref }}
+
+      - name: Compile with Gulp
+        uses: elstudio/actions-js-build/build@v2
+
+      - name: Commit changes
+        uses: elstudio/actions-js-build/commit@v3
+        with:
+          commitMessage: Regenerate css