Add comprehensive CI documentation to README files

Co-authored-by: dwinkler1 <22460147+dwinkler1@users.noreply.github.com>

README.md

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+# Nix Project Templates (np)
+
+A collection of Nix flake templates for reproducible development environments.
+
+## Templates
+
+### RDE (Research Development Environment)
+
+The default template for data science and research projects with support for R, Python, and Julia.
+
+**Quick start:**
+```bash
+nix flake init -t github:dwinkler1/np#rde
+nix develop
+```
+
+**Features:**
+- 🔬 Multi-language support (R, Python, Julia)
+- 📦 Reproducible with Nix
+- 🎨 Neovim-based IDE with LSP support
+- 📊 Research-focused workflows
+- 🔧 Modular and customizable
+
+See [templates/rde/README.md](templates/rde/README.md) for full documentation.
+
+## CI/CD
+
+All templates are automatically tested to ensure functionality:
+
+- **Build Tests**: Templates build successfully on Linux and macOS
+- **Functionality Tests**: All commands and language support are verified
+- **Configuration Tests**: Multiple configurations (R, Python, Julia) are tested
+- **Automated Updates**: Dependencies are updated daily via automated PRs
+
+### CI Workflows
+
+- `.github/workflows/check.yml` - Comprehensive functionality tests (Ubuntu)
+- `.github/workflows/check_macos.yml` - macOS compatibility tests
+- `.github/workflows/update.yml` - Automated dependency updates
+
+## Usage
+
+1. **Initialize a new project:**
+   ```bash
+   nix flake init -t github:dwinkler1/np#rde
+   ```
+
+2. **Enter development environment:**
+   ```bash
+   nix develop
+   # or with direnv
+   echo "use flake" > .envrc && direnv allow
+   ```
+
+3. **Start working:**
+   ```bash
+   p-initProject  # Create project structure
+   p              # Launch Neovim
+   ```
+
+## Contributing
+
+Contributions are welcome! Please ensure:
+- All templates pass CI tests
+- Documentation is updated for new features
+- Code follows existing patterns
+
+## License
+
+See [LICENSE](LICENSE) file for details.