Add configuration for probot-stale for github

.github/stale.yml

@@ -0,0 +1,24 @@
+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an Issue or Pull Request becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale Issue or Pull Request is closed
+daysUntilClose: 7
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - Assigned
+# Label to use when marking as stale
+staleLabel: Stale
+# Comment to post when marking as stale. Set to `false` to disable
+markComment: >
+  This 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 removing the stale label. Set to `false` to disable
+unmarkComment: false
+# Comment to post when closing a stale Issue or Pull Request. Set to `false` to disable
+closeComment: >
+  This has been automatically closed because it has not had
+  recent activity. Please feel free to update or reopen it.
+# Limit to only `issues` or `pulls`
+only: pulls