chore(github): add stale bot app (#940)

.commitlintrc.js

@@ -51,6 +51,7 @@ module.exports = {
                 "ide",
                 "license",
                 "debug",
+                "github",
             ],
         ],
         "scope-case": [2, "always", ["lower-case", "kebab-case"]],

.github/stale.yml

@@ -0,0 +1,22 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - good first issue
+
+# 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. Thank you
+  for your contributions.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false