Add README, .gitignore, and clean up build artifacts

- Added comprehensive README with usage instructions
- Added .gitignore to prevent build artifacts from being committed
- Removed target/ directories and duplicate WASM files
- Cleaned up parser binaries and test files

README.md

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+# tree-sitter-xml
+
+A [Tree-sitter](https://tree-sitter.github.io/tree-sitter/) grammar for XML files as used in the [nand2tetris](https://www.nand2tetris.org/) course.
+
+## Supported File Types
+
+- `.xml` - XML compiler output files
+
+## Features
+
+- **Syntax highlighting** for XML elements, attributes, and text content
+- **Code navigation** with outline support for XML structure
+- **Bracket matching** for XML tags
+- **Integration** with Zed editor and other Tree-sitter compatible editors
+
+## Usage
+
+This grammar is designed to work with the [nand2tetris-zed](https://github.com/soconnor0919/nand2tetris-zed) extension for Zed editor, providing complete language support for the nand2tetris course.
+
+## Grammar Details
+
+- **Language**: XML
+- **Scope**: `source.xml`
+- **File Types**: `.xml`
+- **Node Types**: `element`, `tag_name`, `attribute`, `attribute_name`, `attribute_value`, `text`, `comment`
+
+## Development
+
+### Building
+
+```bash
+# Generate parser
+tree-sitter generate
+
+# Build parser
+tree-sitter build
+
+# Test grammar
+tree-sitter test
+```
+
+## License
+
+MIT License - see [LICENSE](LICENSE) file for details.
+
+## Related
+
+- [nand2tetris-zed](https://github.com/soconnor0919/nand2tetris-zed) - Complete Zed extension
+- [nand2tetris.org](https://www.nand2tetris.org/) - Course website
+- [Tree-sitter](https://tree-sitter.github.io/tree-sitter/) - Parser generator