feat: add stale issues config #33 (#55)

Author: heitorlessa

.github/stale.yml

@@ -0,0 +1,17 @@
+only: issues
+daysUntilStale: 30
+daysUntilClose: 7
+exemptLabels:
+  - bug
+  - documentation
+  - enhancement
+  - feature-request
+  - RFC
+staleLabel: pending-close-response-required
+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.
+closeComment: >
+  This issue has been automatically closed because of inactivity.
+  Please open a new issue if you are still encountering problems.