chore: add configuration for stale-bot

.github/stale.yml

@@ -0,0 +1,26 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - keep
+  - enhancement
+  - bug
+  - documentation
+  - security
+# Label to use when marking an issue as stale
+staleLabel: stale
+# 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 any
+  recent activity. The resources of the Academic team are limited, and so we are asking for your help.
+
+  If this is a **bug** and you can still reproduce this error on the <code>master</code> branch, please reply with all of the information you have about it in order to keep the issue open.
+
+  If this is a **feature request**, and you feel that it is still relevant and valuable, please tell us why.
+
+  This issue will automatically close soon if no further activity occurs. Thank you for your contributions.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false