docs: add PyPI publishing instructions

Author: andrewmonostate

PUBLISHING.md

@@ -0,0 +1,60 @@
+# Publishing to PyPI
+
+## Prerequisites
+
+1. Create a PyPI account at https://pypi.org/account/register/
+2. Generate an API token at https://pypi.org/manage/account/token/
+3. Install build tools: `pip install build twine`
+
+## Publishing Steps
+
+1. **Build the package:**
+   ```bash
+   python -m build
+   ```
+
+2. **Check the package:**
+   ```bash
+   twine check dist/*
+   ```
+
+3. **Upload to PyPI:**
+   ```bash
+   # Using environment variable
+   export TWINE_USERNAME=__token__
+   export TWINE_PASSWORD=your-pypi-api-token
+   twine upload dist/*
+   
+   # Or interactively
+   twine upload dist/*
+   # Username: __token__
+   # Password: your-pypi-api-token
+   ```
+
+## Testing on Test PyPI First
+
+1. Upload to Test PyPI:
+   ```bash
+   twine upload --repository testpypi dist/*
+   ```
+
+2. Test installation:
+   ```bash
+   pip install --index-url https://test.pypi.org/simple/ browsernative
+   ```
+
+## After Publishing
+
+Users can install with:
+```bash
+pip install browsernative
+```
+
+## Version Updates
+
+1. Update version in `browsernative/__init__.py`
+2. Update version in `setup.py` and `pyproject.toml`
+3. Update CHANGELOG.md
+4. Create git tag: `git tag v1.0.1`
+5. Push tags: `git push --tags`
+6. Build and upload new version