feat: initial nuwiki Rust workspace (core, lsp, ls)

README.md

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+# nuwiki-rs
+
+Rust crates powering [nuwiki](https://code.gfran.co/gffranco/nuwiki): the vimwiki-compatible language server and editor plugin for Vim/Neovim.
+
+## Crates
+
+- **nuwiki-core** — Vimwiki lexer, parser, AST, HTML renderer, and date utilities
+- **nuwiki-lsp** — Language Server Protocol implementation (tower-lsp)
+- **nuwiki-ls** — Binary entry point (stdio server bridge)
+
+## Quick Start
+
+```bash
+# Build
+cargo build --release -p nuwiki-ls
+
+# Run
+cargo run --bin nuwiki-ls
+
+# Tests
+cargo test
+```
+
+## License
+
+Licensed under MIT or Apache-2.0, at your option. See `LICENSE-MIT` and `LICENSE-APACHE`.