added example folder

Example/README.md

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+# Unity UDP Example
+
+This example demonstrates how to use the UnityUDP Flutter app to send commands to a Unity game.
+
+## Setup
+
+### Unity Setup
+
+1. Copy `UDPCommandListener.cs` into your Unity project's `Assets/Scripts/` folder
+2. Create a new empty GameObject in your scene (GameObject → Create Empty)
+3. Rename it to "UDP Manager"
+4. Attach the `UDPCommandListener` script to the UDP Manager GameObject
+5. Set the port to 7777 (or any port you prefer) in the inspector
+
+### Example Scene Setup
+
+For the example commands to work, create a simple test scene:
+
+1. Create a Cube (GameObject → 3D Object → Cube)
+2. Name it "TestCube"
+3. Create a UI Canvas with a Text element showing a timer (optional, for the timer command)
+
+### Testing the Example
+
+1. Run your Unity game
+2. Open the UnityUDP Flutter app
+3. Copy/move the `unityudp_projects.json` file to your Documents folder
+4. Select a command and send it to your Unity game (make sure the IP address matches your computer's local IP and port is 7777)
+
+## Sample Commands
+
+The example includes these simple commands:
+
+- **Toggle Cube**: Enables/Disables the TestCube GameObject
+- **Start Timer**: Starts a 10-second countdown timer
+- **Reset Scene**: Reloads the current scene
+
+## UDP Protocol
+
+The UDP commands are sent as JSON strings with the following format:
+
+```json
+{
+  "command": "command_name",
+  "value": "optional_value"
+}
+```
+
+The Unity script parses these JSON commands and executes the corresponding action.
+
+## Customizing
+
+You can add your own commands by:
+
+1. Adding a new case in the `ProcessCommand` method in `UDPCommandListener.cs`
+2. Creating a corresponding JSON entry in your project file
+
+## Troubleshooting
+
+- **Commands not working**: Check that your firewall allows UDP traffic on the specified port
+- **Can't connect**: Verify the IP address is correct (use `ipconfig` on Windows or `ifconfig` on Mac/Linux)
+- **Unity crashes**: Make sure all GameObject names match the ones in the script
+