add workflow test

.github/workflows/main.yml

@@ -0,0 +1,16 @@
+name: Simple Workflow
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v2
+
+      - name: Print Hello World
+        run: echo "Hello World"