Create main.yml

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: first workflow automation
+on:
+  push:
+    branches: ["master"]
+
+  commit_comment:
+    branches: ["master"]
+
+  pull_request:
+    branches: ["master"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: greeting workflow
+        run: 
+           echo "hello world"