Add contributing guide

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Features, Bug Reports, Questions
+    url: https://github.com/basecamp/once-campfire/discussions/new/choose
+    about: Please use the discussions area to report issues or ask quest

.github/ISSUE_TEMPLATE/preapproved.md

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+---
+name: Pre-Discussed and Approved Topics
+about: |-
+  For topics already discussed and approved in the GitHub Discussions section.
+---
+
+** PLEASE START A DISCUSSION INSTEAD OF OPENING AN ISSUE **
+** For more details see CONTRIBUTING.md **