feat: bootstrap skeleton + lexer (Phase 0)

README.md

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+# Bux Programming Language
+
+> **Status:** Bootstrap phase — compiler written in Nim, targeting self-hosting.
+
+Bux is a fast, compiled, strongly-typed systems programming language inspired by [Rux](https://rux-lang.dev/). The long-term goal is a self-hosted compiler with a minimal runtime, native x86-64 backend, and modern tooling.
+
+## Quick Start
+
+```bash
+# Build the bootstrap compiler (Nim)
+make build
+
+# Create a new project
+bux new hello
+
+# Build and run
+bux run
+```
+
+## Syntax Preview
+
+```bux
+import Std::Io::PrintLine;
+
+func Main() -> int {
+    let message: *char8 = c8"Hello, Bux!";
+    PrintLine(message);
+    return 0;
+}
+```
+
+## Roadmap
+
+See [`PLAN.md`](PLAN.md) for the full roadmap to self-hosting.
+
+## License
+
+MIT