Add CLAUDE.md with project description and setup instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# Dotfiles
+
+Personal dotfiles repository for development environment configuration.
+
+## Structure
+
+- `nvim/` — Neovim configuration (symlinked to `~/.config/nvim`)
+
+## Neovim
+
+Config built for Neovim 0.11+ using native APIs (`vim.lsp.config`, `vim.lsp.enable`, built-in treesitter).
+
+**Plugin manager:** lazy.nvim (auto-bootstraps on first launch).
+
+**Languages:** Rust, Zig, TypeScript/JavaScript, C/C++.
+
+**LSP servers:**
+- `rust-analyzer` — via rustaceanvim (install with `rustup component add rust-analyzer`)
+- `clangd` — via mason (auto-installed)
+- `ts_ls` — via mason (auto-installed)
+- `zls` — manual install (`brew install zls`)
+
+**Key plugins:** telescope, treesitter, nvim-cmp, bufferline, neo-tree, gitsigns, lazygit, lualine, which-key, persistence, alabaster theme.
+
+**Leader key:** Space.
+
+## Setup
+
+```bash
+# Symlink nvim config
+ln -s ~/Docs/Projects/dotfiles/nvim ~/.config/nvim
+
+# Install lazygit
+brew install lazygit
+
+# First nvim launch will auto-install plugins, then run:
+# :TSInstall rust zig typescript javascript tsx c cpp lua json yaml toml html css markdown bash
+```