Add ci.yml running fmt, clippy, build, and test on stable + nightly
Rust for PRs and pushes to main. Add release.yml for automated crate
publishing to crates.io on version tag pushes. Remove dead_code allow
and add crate-level doc comment with usage example.
Set up Cargo.toml with dependencies (reqwest, serde, thiserror, tokio,
uuid, chrono). Implement OnspringClient with builder pattern and HTTP
helper methods. Define error types, enums, and paging models.
Stevan Freeborn