Add stale.yml

.github/stale.yml

@@ -0,0 +1,12 @@
+daysUntilStale: 60
+daysUntilClose: 15
+exemptLabels:
+  - pinned
+  - security
+staleLabel: wontfix
+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 have any question, please contact me directly at [email protected]. Thank you
+  for your contributions to that project!
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false