added mark stale action

.github/workflows/mark-stale.yml

@@ -0,0 +1,29 @@
+name: Mark Stale Issues and PRs
+
+on:
+  schedule:
+  - cron: "30 1 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Mark Stale
+      uses: actions/stale@v3
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        exempt-all-milestones: true
+        stale-issue-message: 'This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this issue will be closed in 30 days.'
+        stale-pr-message: 'This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this PR will be closed in 14 days.'
+        close-issue-message: 'This issue was closed because it has been stale for 30 days with no activity.'
+        close-pr-message: 'This PR was closed because it has been stale for 14 days with no activity.'
+        days-before-issue-stale: 90
+        days-before-pr-stale: 45
+        days-before-issue-close: 30
+        days-before-pr-close: 14
+        stale-issue-label: 'stale'
+        stale-pr-label: 'stale'
+        closed-issue-label: 'closed-stale'
+        closed-pr-label: 'closed-stale'