added basic workflow

.github/workflows/hello_world.yml

@@ -0,0 +1,25 @@
+name: Hello world workflow
+on: 
+   push:
+     branches:
+       - main
+   pull_request:
+     branches:
+       - main
+   workflow_dispatch:
+jobs:
+  hello:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name:  hello world
+        run: echo "Hello world"
+        shell: bash
+   goodbye:
+     runs-on: ubuntu-latest
+     steps:
+       - name: Goodbye world
+         run: echo "Goodbye World"
+         shell: bash
+
+