Add README with setup and usage instructions

README.md

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+# Dotfiles
+
+My personal dotfiles for quick setup on new machines. Change once, update everywhere.
+
+## What's Included
+
+| File | Description |
+|------|-------------|
+| `.bashrc` | Bash configuration with custom prompt, aliases, lazy-loaded conda/nvm, auto-start tmux |
+| `.tmux.conf` | tmux config with vi keybindings and TPM plugins |
+| `.vimrc` | Vim configuration with clipboard support, syntax highlighting, and sensible defaults |
+| `setup.sh` | Bootstrap script for new Debian-like machines |
+
+## Quick Install on a New Machine
+
+```bash
+curl -fsSL https://gitea.sjhl.nz/james/dotfiles/raw/branch/main/setup.sh | bash
+```
+
+Or manually:
+
+```bash
+git clone --bare https://gitea.sjhl.nz/james/dotfiles ~/.dotfiles
+
+# Define the dotfiles alias
+dotfiles() {
+    /usr/bin/git --git-dir="$HOME/.dotfiles/" --work-tree="$HOME" "$@"
+}
+
+# Checkout files (will prompt if conflicts exist)
+dotfiles checkout
+
+# Hide untracked files from status
+dotfiles config --local status.showUntrackedFiles no
+```
+
+## Managing Your Dotfiles
+
+After installation, the `dotfiles` command is available in your shell:
+
+```bash
+# View status
+dotfiles status
+
+# Add changes
+dotfiles add .bashrc
+dotfiles commit -m "Update prompt"
+dotfiles push
+```
+
+The alias is already defined in `.bashrc`, so it's available in new terminals.
+
+## tmux Usage
+
+tmux starts automatically when you open a new terminal (configured in `.bashrc`).
+
+**Basic Commands:**
+| Command | Action |
+|---------|--------|
+| `tmux` | Start new session |
+| `tmux ls` | List sessions |
+| `tmux attach -t 0` | Attach to session 0 |
+| `Ctrl+b d` | Detach from session |
+| `Ctrl+b c` | Create new window |
+| `Ctrl+b %` | Split vertically |
+| `Ctrl+b "` | Split horizontally |
+| `Ctrl+b [` | Copy/vi mode |
+| `q` | Exit copy mode |
+
+**Install TPM plugins:**
+After first tmux start, press `Ctrl+b I` to install plugins (tpm, tmux-sensible, tmux-yank).
+
+## Vim Usage
+
+| Command | Action |
+|---------|--------|
+| `vi` or `vim` | Open editor |
+| `:w` | Save |
+| `:q` | Quit |
+| `:q!` | Force quit |
+| `/pattern` | Search |
+| `n` | Next search match |
+| `yy` | Yank (copy) line |
+| `p` | Paste |
+| `u` | Undo |
+| `Ctrl+r` | Redo |
+
+Clipboard is integrated - yanking/pasting works with system clipboard.
+
+## Uninstall
+
+To remove dotfiles from a machine:
+
+```bash
+dotfiles checkout HEAD
+dotfiles clean -fd
+rm -rf ~/.dotfiles ~/.dotfiles-backup
+```
+
+Your original files will be restored from the backup created during checkout.