implement 11.4 Date and directory contents

Author: devserkan

.github/workflows/hello.yml

@@ -10,5 +10,8 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Say hello
-        run: |
-          echo "Hello World!"
+        run: echo "Hello World!"
+      - name: Now it is
+        run: date
+      - name: Directory content
+        run: ls -l