added stalebot config

.github/stale.yml

@@ -0,0 +1,21 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+  - bug
+  - "help wanted"
+  - enhancement
+  - "breaking dependencies"
+# Label to use when marking an issue as stale
+staleLabel: wontfix
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
+  If you believe the issue is still relevant, please test on the latest ATD and report back.
+  Thank you for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false