GURT protocol (lib, cli, gdextension, Flumi integration)

protocol/gdextension/README.md

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+GURT networking extension for Godot.
+
+## Quick Start
+
+1. **Build the extension:**
+   ```bash
+   ./build.sh
+   ```
+
+2. **Install in your Godot project:**
+   - Copy `addon/gurt-protocol/` to your project's `addons/` folder (e.g. `addons/gurt-protocol`)
+   - Enable the plugin in `Project Settings > Plugins`
+
+3. **Use in your game:**
+   ```gdscript
+   var client = GurtProtocolClient.new()
+   client.create_client(30)  # 30s timeout
+   
+   var response = client.request("gurt://127.0.0.1:4878", {"method": "GET"})
+
+   client.disconnect() # cleanup
+   
+   if response.is_success:
+      print(response.body) // { "content": ..., "headers": {...}, ... }
+   else:
+      print("Error: ", response.status_code, " ", response.status_message)
+   ```
+
+## Build Options
+
+```bash
+./build.sh                    # Release build for current platform
+./build.sh -t debug           # Debug build
+./build.sh -p windows         # Build for Windows
+./build.sh -p linux           # Build for Linux  
+./build.sh -p macos           # Build for macOS
+```