[chore](trx-rs): add local copy of docs

Signed-off-by: Stan Grams <sjg@haxx.space>

docs/Home.md

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+# trx-rs
+
+`trx-rs` is a modular amateur radio control stack written in Rust. It splits
+hardware access, DSP, transport, and user-facing interfaces into separate
+components so a radio or SDR can be controlled locally while audio, decoding,
+and remote control are exposed elsewhere on the network.
+
+## Documentation
+
+- [User Manual](User-Manual) — configuration, features, and usage
+- [Architecture](Architecture) — system design, crate layout, data flow, and internals
+- [Optimization Guidelines](Optimization-Guidelines) — performance guidelines for the real-time DSP pipeline
+- [Planned Features](Planned-Features) — planned features and design notes
+- [Improvement Areas](Improvement-Areas) — codebase audit: quality, architecture, security, and performance