Convert README, CONTRIBUTING, CODE_OF_CONDUCT to markdown

[internetisaiah]

Summary

Converting README, CONTRIBUTING, CODE_OF_CONDUCT to markdown so it's more readable on mobile and within the github website. Also updated the links in the PR template so they point to the right places in these files.

Related PRs, issues, or features (optional)

• N/A

Metadata

• [ ] Adds new file(s)
• [x] Edits existing file(s)
• [ ] Removes file(s)

PR contributor checklist

• [x] My PR follows the Kobiton Docs contributor guidelines, meaning:

  • My content contains correct spelling and grammar.
  • My files are named and structured correctly.
  • My style and voice follows the Microsoft Style Guide.
  • I added all new pages to their section's nav.adoc file.
  • I removed all localizations (like en-us) from my URLs.