Configure bot for managing stale issues (#598)

.github/stale.yml

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+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+
+# Number of days of inactivity before a stale Issue or Pull Request is closed.
+# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
+daysUntilClose: 60
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - frozen
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: true
+
+# Label to use when marking an issue as stale
+staleLabel: stale
+
+issues:
+  # 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 issue is still affecting you, just comment with any updates and we'll keep it open.
+    Thank you for your contributions.
+
+  # Comment to post when closing a stale issue. Set to `false` to disable
+  closeComment: >
+    Closing this issue after a prolonged period of inactivity.
+    If this issue is still present in the latest release, please create a new issue with up-to-date information. Thank you!
+
+pulls:
+  # Comment to post when marking a pull request as stale.
+  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 pull request is still relevant, just comment with any updates and we'll keep it open.
+    Thank you for your contributions.
+
+  # Comment to post when closing a stale pull request. Set to `false` to disable
+  closeComment: >
+    Closing this pull request after a prolonged period of inactivity.
+    If this issue is still present in the latest release, please ask for this pull request to be reopened. Thank you!
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30