add metadrive in readme.md

README.md

@@ -285,7 +285,7 @@ P.S: The `.py` file in `Runnable Demo` can be found in `dizoo`
 |  32  |[beergame](https://github.com/OptMLGroup/DeepBeerInventory-RL) | ![discrete](https://img.shields.io/badge/-discrete-brightgreen) | ![original](./dizoo/beergame/beergame.png) | [dizoo link](https://github.com/opendilab/DI-engine/tree/main/dizoo/beergame/envs)<br>环境指南 |
 |  33  |[classic_control/acrobot](https://github.com/openai/gym/tree/master/gym/envs/classic_control) | ![discrete](https://img.shields.io/badge/-discrete-brightgreen) | ![original](./dizoo/classic_control/acrobot/acrobot.gif) | [dizoo link](https://github.com/opendilab/DI-engine/tree/main/dizoo/classic_control/acrobot/envs)<br>环境指南 |
 |  34  |[box2d/car_racing](https://github.com/openai/gym/blob/master/gym/envs/box2d/car_racing.py) | ![discrete](https://img.shields.io/badge/-discrete-brightgreen) <br> ![continuous](https://img.shields.io/badge/-continous-green) | ![original](./dizoo/box2d/carracing/car_racing.gif) | [dizoo link](https://github.com/opendilab/DI-engine/tree/main/dizoo/box2d/carracing/envs)<br>环境指南 |
-|  35  |[metadrive](https://github.com/metadriverse/metadrive/blob/main/metadrive) | ![continuous](https://img.shields.io/badge/-continous-green) | ![original](./dizoo/metadrive/metadrive.gif) | [dizoo link](https://github.com/opendilab/DI-engine/tree/main/dizoo/metadrive/env)<br>环境指南 |
+|  35  |[metadrive](https://github.com/metadriverse/metadrive) | ![continuous](https://img.shields.io/badge/-continous-green) | ![original](./dizoo/metadrive/metadrive_env.gif) | [dizoo link](https://github.com/opendilab/DI-engine/tree/main/dizoo/metadrive/env)<br>环境指南 |
 
 ![discrete](https://img.shields.io/badge/-discrete-brightgreen) means discrete action space