feat(repo): Modify github on push

- Close all PR
- Add mirror information in README.md

.github/workflows/stale.yaml

@@ -0,0 +1,28 @@
+# Thanks to blender authors to provide this.
+# Adaptation made for Katenary
+
+name: Close GitHub Pull Requests
+
+# Trigger this workflow every 12 hours.
+on:
+  schedule:
+    - cron: "* */12 * * *"
+
+jobs:
+  close_prs:
+    name: Close Pull Requests
+    runs-on: ubuntu-latest
+    if: contains(github.server_url, 'github.com')
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          # Number of days before a pull request is marked as stale.
+          days-before-pr-stale: 0
+          # Number of days before a pull request is closed.
+          days-before-pr-close: 0
+          # Message posted when closing a pull request.
+          stale-pr-message: |
+            This pull request has been automatically closed because this repository is a read-only mirror. 
+            Katenary developement happens on [repo.katenary.io](https://repo.katenary.io/Katenary/katenary).