Setup CI

[Samyak2]

Tracking issue for setting up basic CI on GitHub Actions.

The CI should check:

• [ ] cargo check
• [ ] cargo test
• [ ] cargo fmt --check
• [ ] cargo clippy --all-targets
• [ ] cargo doc
• [ ] conventional commits. Could use conventional_commits_linter. This is a personal choice, but I want commits in this repo to follow this standard.