Add stale action

+name: "Close stale issues"
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: "This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days"
+          close-issue-message: "Closing this stale issue because it has no activity."
+          days-before-stale: 20
+          days-before-close: 5
+          exempt-issue-labels: "needs triage,help wanted,enhancement,bug"