Add stale configuration (#878)

* Add stale configuration

Uses the stale.yml from the SDK repo here to configure Stale bot.

Co-authored-by: Richard McClellan <[email protected]>

Author: jpignata

.github/stale.yml

@@ -0,0 +1,18 @@
+# Number of days of inactivity before an issue becomes stale
+# Setting this to 100 years, because we do not want to automatically mark issues as stale
+daysUntilStale: 36500
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Label to use when marking an issue as stale
+staleLabel: Closing Soon
+# 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. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: >
+  This issue has been automatically closed because of inactivity.
+  Please open a new issue if you are still encountering problems.
+# Limit to only `issues` or `pulls`
+only: issues