chore: community standard updates

[ya7on]

Summary of changes:

• Added Code of Conduct file. I took file content from contributor-covenant.org
• Added Pull Request template
• Added following Issue forms: "bug report", "feature request"
• CI Updates:
  • Removed CI trigger on push to "master" because it duplicated trigger. Merge queue check master changes on PR merge
  • Split parallel jobs. Now Test running after Build job. These changes are for my thoughts about future adding more CI jobs like static analyzers and prettier formatting.
• GitHub recommended community standards:
  • Added contributing guideline document
  • Added security policy file
• Added docs/ directory:
  • Added guideline for developers that build application based on this contract. This is user guide so to speak.
  • Added SUMMARY.md file for Table of Contents for GitBook