fix: Add automatic pull request comment

.github/workflows/comment.yaml

@@ -0,0 +1,32 @@
+name: auto comment
+on:
+  pull_request:
+    types: [opened]
+    branches: [main]
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/github-script@v7
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `Hi there! 👋
+
+              Thank you for your contribution to the FIP Guide! 🚀
+              We appreciate your effort in making rail staff travel information more accessible. 🚄
+
+              ## Checklist before merging:
+
+              - [ ] Added a description to the Pull Request
+              - [ ] Checked the License of new pictures (non-commercial use without attribution)
+              - [ ] Modified content in English
+              - [ ] Modified content in German
+              - [ ] Modified content in French`
+            })