Initial commit: terminal file browser & markdown viewer

A beautiful TUI for browsing files and reading markdown/code:
- Two-pane layout with file tree and content viewer
- Markdown rendering via Glamour
- Syntax highlighting via Chroma
- Auto-detects light/dark terminal theme
- Arrow key navigation, Esc to go back
- Page Up/Down, Home/End for scrolling

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# Reader
+
+A beautiful terminal file browser and markdown viewer built with Go and the Charm ecosystem.
+
+## Features
+
+- **File Tree Navigation**: Browse directories with expand/collapse functionality
+- **Markdown Rendering**: Beautiful markdown display using Glamour
+- **Syntax Highlighting**: Code files rendered with Chroma
+- **Vim-like Keybindings**: Navigate efficiently with familiar keys
+- **Responsive Layout**: Adapts to terminal size
+
+## Installation
+
+```bash
+go build -o reader
+```
+
+## Usage
+
+```bash
+# Open current directory
+./reader
+
+# Open a specific directory
+./reader ~/Documents
+
+# Show help
+./reader --help
+```
+
+## Keyboard Shortcuts
+
+### File Browser
+| Key | Action |
+|-----|--------|
+| `↑` / `↓` | Move up/down |
+| `Enter` | Open file or folder |
+| `←` | Collapse folder / go to parent |
+| `→` | Expand folder / open file |
+
+### Reading a File
+| Key | Action |
+|-----|--------|
+| `↑` / `↓` | Scroll up/down |
+| `PgUp` / `PgDn` | Page up/down |
+| `Home` / `End` | Jump to top/bottom |
+| `Esc` | Back to file browser |
+
+### General
+| Key | Action |
+|-----|--------|
+| `?` | Show help |
+| `q` | Quit |
+
+## Built With
+
+- [Bubbletea](https://github.com/charmbracelet/bubbletea) - TUI framework
+- [Lipgloss](https://github.com/charmbracelet/lipgloss) - Styling
+- [Glamour](https://github.com/charmbracelet/glamour) - Markdown rendering
+- [Chroma](https://github.com/alecthomas/chroma) - Syntax highlighting
+- [Bubbles](https://github.com/charmbracelet/bubbles) - UI components
+
+## License
+
+MIT