new producer template

.github/ISSUE_TEMPLATE/producer-onboarding.md

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+---
+name: Add New GCN Notice Producer
+about: Checklist to add a new producer of GCN Notices
+labels: new-producer
+---
+
+<!--
+Note: this text is a comment, and won't show up in the issue.
+Please search existing issues to check if your issue has already been recorded.
+Fill out the sections below. Delete any sections that are not relevant.
+-->
+
+# Description
+
+Steps for onboarding new notices from the #### mission/observatory/instrument.
+Documentation: https://gcn.nasa.gov/docs/notices/producers
+Unified Schema: https://gcn.nasa.gov/docs/notices/schema
+
+# Acceptance criteria
+
+- [ ] create topics/acls
+- [ ] JSON schema
+- [ ] mission page
+- [ ] add to quickstart
+- [ ] announcement
+
+# Mission contact people