Add the stale workflow

Mark PR and issues for stale after 60 days of inactivity.
After other 7 days close the issue/PR.

Author: daquinoaldo

.github/workflows/stale.yml

@@ -0,0 +1,16 @@
+name: "Stale"
+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: "Marked as stale for no activity in the past 60 days. In 7 days it will be closed unless new activity."
+        stale-pr-message: "Marked as stale for no activity in the past 60 days. In 7 days it will be closed unless new activity."
+        exempt-issue-labels: "no-stale"
+        exempt-pr-labels: "no-stale"