docs(issues): update issue bot to comment on help wanted issues

.github/ionic-issue-bot.yml

@@ -3,6 +3,24 @@ triage:
   removeLabelWhenProjectAssigned: true
   dryRun: false
 
+comment:
+  labels:
+    - label: "help wanted"
+      message: >
+        This issue has been labeled as `help wanted`. This label is added to issues
+        that we believe would be good for contributors.
+
+        If you'd like to work on this issue, please comment here letting us know that
+        you would like to submit a pull request for it. This helps us to keep track of
+        the pull request and make sure there isn't duplicated effort.
+
+        For a guide on how to create a pull request and test this project locally to see
+        your changes, see our [contributing documentation](https://ionicframework.com/docs/building/contributing).
+
+
+        Thank you!
+  dryRun: false
+
 closeAndLock:
   labels:
     - label: "ionitron: support"