added gh workflow (#17)

* added gh workflow

* added co-owner

.github/CODEOWNERS

@@ -0,0 +1 @@
+@injas427

.github/workflows/restrict-merges.yml

@@ -0,0 +1,19 @@
+name: Enforce Merge Source Branch
+
+on:
+  pull_request:
+    branches:
+      - main  # Replace with your protected branch name
+
+jobs:
+  restrict-source-branch:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check source branch
+        run: |
+          if [[ "${{ github.base_ref }}" != "main" || "${{ github.head_ref }}" != "develop" ]]; then
+            echo "Pull requests to main must originate from develop."
+            exit 1
+          fi
+        shell: bash