Added Stale Workflow

.github/workflows/stale.yml

@@ -0,0 +1,22 @@
+name: Mark and close stale issues and pull requests
+
+on:
+  schedule:
+  - cron: "0 0 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'It looks like this has been idle a while, so I am marking it as stale. Remove the label or comment if this issue should remain open.'
+        stale-pr-message: 'It looks like this PR has been idle a while, so I am marking it as stale. Remove the label or comment if this is still being worked on.'
+        stale-issue-label: 'no-activity'
+        stale-pr-label: 'no-activity'
+        exempt-pr-labels: 'help wanted'
+        days-before-stale: 30
+        days-before-close: 5