added cta to markdown

Author: kelenelee

.github/ISSUE_TEMPLATE/1-onboarding.md

@@ -6,7 +6,9 @@ labels: 'pts: 1'
 assignees: ''
 
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-<!-- Once you submit this issue, you'll be able to interact with this checklist and start checking off action items. -->
+<!-- Click the green button "Submit new issue" !!!!! 
+
+Once you submit this issue, you'll be able to interact with this checklist and start checking off action items. -->