Added Stale bot config - decided on 30 days (issues) / 60 days (prs) to mark as stale + another 7 to close

.github/stale.yml

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+# 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:
+  - important
+# 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
+  recent activity. It will be closed if no further activity occurs.
+  If this is still an issue, please make sure it is up to date and if so,
+  add a comment that this is still an issue to keep it open.
+  Thank you for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+pulls:
+  daysUntilStale: 60
+  markComment: >
+    This pull request has been automatically marked as stale because it has not had
+     recent activity. It will be closed if no further activity occurs.
+     If this is still applicable, please make sure it is up to date and if so,
+     add a comment that this is still an issue to keep it open.
+     Thank you for your contributions.