Quality of Life updates to repo

[willingc]

• Update default branch to main
• Update README and move old install instructions out to a legacy file
• Add CoC doc
• Add a license
• Move to GH Actions for testing
• Add a Change Log
• Add a Contributing file
• Triage open issues
• Triage open PRs
• Do a dependency update/review
• Add code quality for CI

[willingc]

#55 adds a changelog

[hydrosquall]

A few more that fall under the quality of life umbrella

• [ci] Add auto to manage versions, changelog, and deployment to NPM #63
• chore: pre-commit hooks for code style and commit message quality #66
• Optional: making it easier for someone to supply commit messages in the expected format by adding a CLI tool to support authorship: https://github.com/commitizen/cz-cli (Update: implemented in chore: set up + document commitizen-cli for authoring clear commit messages #68 )
• tooling for keeping 3p deps up to date : https://github.com/marketplace/renovate