enhancement: Added Block readme github action

.github/workflows/block-readme-prs.yml

@@ -0,0 +1,53 @@
+name: Block README PRs
+on:
+  pull_request_target:
+    types: [opened, edited, synchronize]
+permissions:
+  pull-requests: write
+  contents: read
+  issues: write
+jobs:
+  check-readme:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout PR
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+
+      - name: Get list of changed files
+        id: changes
+        run: |
+          git fetch origin ${{ github.base_ref }}
+          git diff --name-only origin/${{ github.base_ref }}..HEAD > changed_files.txt
+          cat changed_files.txt
+
+      - name: Block PR if README is changed
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          USER_PERMISSION="${{ github.event.pull_request.author_association }}"
+          if [[ "$USER_PERMISSION" == "OWNER" ]] || [[ "$USER_PERMISSION" == "MEMBER" ]] || [[ "$USER_PERMISSION" == "COLLABORATOR" ]]; then
+            echo "User has write access. Allowing PR."
+            exit 0
+          fi
+
+          if [ "$(wc -l < changed_files.txt)" -eq 1 ] && grep -q "^Readme.md$" changed_files.txt; then
+            echo "PR only changes README.md from external contributor. Blocking..."
+            gh pr comment ${{ github.event.pull_request.number }} --body "**This PR has been automatically closed.**
+
+          This PR only modifies the README file. We appreciate your interest in contributing, but we're currently not accepting README-only changes from external contributors.
+
+          If you'd like to contribute, please consider:
+          - Fixing bugs
+          - Adding new features
+          - Improving documentation beyond just the README
+          - Writing tests
+
+          Thank you for your understanding!"
+            gh pr close ${{ github.event.pull_request.number }}
+            exit 1
+          else
+            echo "PR modifies more than just README.md. Allowed."
+          fi