docs: implement versioning system and enhance documentation structure

docs/README.md

@@ -0,0 +1,69 @@
+# OrbbecSDK V2 ROS2 Documentation
+
+This repository contains the documentation for OrbbecSDK V2 ROS2 Wrapper in both English and Chinese.
+
+## Documentation Structure
+
+- **English Version**: `docs/en/` - Full English documentation
+- **中文版本**: `docs/zh/` - 完整中文文档
+- **Published Versions**: `docs/version-manifest.json` - Version list for GitHub Pages
+
+## Quick Start
+
+### Build English Documentation:
+```bash
+cd docs/en
+pip install -r requirements.txt
+make clean && make html
+```
+
+### Build Chinese Documentation:
+```bash
+cd docs/zh
+pip install -r requirements.txt
+make clean && make html
+```
+
+### For Full Versioned Site Build:
+```bash
+pip install -r docs/en/requirements.txt -r docs/zh/requirements.txt jieba
+python docs/build_versions.py
+```
+
+## View Documentation
+
+After building, open the following files in your browser:
+- English: `docs/en/_build/html/index.html`
+- Chinese: `docs/zh/_build/html/index.html`
+- Full GitHub Pages site: `site/index.html`
+
+## Project Structure
+
+```
+docs/
+├── en/                      # English documentation
+│   ├── source/             # Source files
+│   ├── conf.py             # Sphinx config
+│   └── requirements.txt    # Python dependencies
+├── zh/                      # Chinese documentation
+│   ├── source/             # Source files
+│   ├── conf.py             # Sphinx config
+│   └── requirements.txt    # Python dependencies
+├── _ext/                    # Shared Sphinx extensions
+├── build_versions.py        # Versioned site builder
+└── version-manifest.json    # Published version definitions
+```
+
+## Notes
+
+1. Make changes to the English version first (`docs/en/`)
+2. Translate and adapt for the Chinese version (`docs/zh/`)
+3. Ensure both versions build successfully
+
+## Dependencies
+
+- Sphinx
+- recommonmark
+- sphinx-rtd-theme
+- jieba (for Chinese search)
+- Required extensions (see requirements.txt in each language folder)