Add .gitignore for docs build artifacts and docs README

Co-authored-by: r41k0u <76248539+r41k0u@users.noreply.github.com>

Author: Copilot

.gitignore

@@ -10,3 +10,7 @@ __pycache__/
 vmlinux.py
 ~*
 vmlinux.h
+
+# Documentation build artifacts
+docs/_build/
+docs/_templates/

docs/README.md

@@ -0,0 +1,66 @@
+# PythonBPF Documentation
+
+This directory contains the Sphinx documentation for PythonBPF.
+
+## Building the Documentation
+
+### Prerequisites
+
+Install the documentation dependencies:
+
+```bash
+pip install -r requirements.txt
+# Or install the optional docs dependencies
+pip install pythonbpf[docs]
+```
+
+### Build HTML Documentation
+
+```bash
+make html
+```
+
+The generated documentation will be in `_build/html/`. Open `_build/html/index.html` in a browser to view.
+
+### Other Build Formats
+
+```bash
+make latexpdf  # Build PDF documentation
+make epub      # Build ePub format
+make clean     # Clean build artifacts
+```
+
+## Documentation Structure
+
+- `index.md` - Main landing page
+- `getting-started/` - Installation and quick start guides
+- `user-guide/` - Comprehensive user documentation
+- `api/` - API reference documentation
+- `conf.py` - Sphinx configuration
+- `_static/` - Static files (images, CSS, etc.)
+
+## Writing Documentation
+
+Documentation is written in Markdown using [MyST-Parser](https://myst-parser.readthedocs.io/). See the existing files for examples.
+
+### MyST Markdown Features
+
+- Standard Markdown syntax
+- Directives using `{directive}` syntax
+- Cross-references using `{doc}` and `{ref}`
+- Admonitions (notes, warnings, tips)
+- Code blocks with syntax highlighting
+
+## Contributing
+
+When adding new documentation:
+
+1. Follow the existing structure
+2. Use MyST Markdown syntax
+3. Include code examples
+4. Test the build with `make html`
+5. Check for warnings and errors
+
+## Online Documentation
+
+The documentation is automatically built and deployed to GitHub Pages (if configured).