update readme

Author: huangshiyu13

Gallery.md

@@ -73,5 +73,6 @@ Users are also welcome to contribute their own training examples and demos to th
 |                                                                                                            [GridWorld](./examples/gridworld/)<br>  <img width="300px" height="auto" src="./docs/images/gridworld.jpg">                                                                                                            |                                                              ![discrete](https://img.shields.io/badge/-discrete-brightgreen)                                                              |      [code](./examples/gridworld/)      |
 |                                                       [Super Mario Bros](https://github.com/Kautenja/gym-super-mario-bros)<br>  <img width="300px" height="auto" src="https://user-images.githubusercontent.com/2184469/40948820-3d15e5c2-6830-11e8-81d4-ecfaffee0a14.png">                                                       |                                   ![discrete](https://img.shields.io/badge/-discrete-brightgreen)     ![image](https://img.shields.io/badge/-image-red)                                   |     [code](./examples/super_mario/)     |
 |                                                                                                       [Gym Retro](https://github.com/openai/retro)<br>  <img width="300px" height="auto" src="./docs/images/gym-retro.jpg">                                                                                                       |                                   ![discrete](https://img.shields.io/badge/-discrete-brightgreen)     ![image](https://img.shields.io/badge/-image-red)                                   |        [code](./examples/retro/)        |
+|                                                                                                        [Crafter](https://github.com/danijar/crafter)<br>  <img width="300px" height="auto" src="https://github.com/danijar/crafter/raw/main/media/video.gif">                                                                                                        |                                   ![discrete](https://img.shields.io/badge/-discrete-brightgreen)     ![image](https://img.shields.io/badge/-image-red)                                   |       [code](./examples/crafter/)       |
 
 </div>

README.md

@@ -126,6 +126,7 @@ Environments currently supported by OpenRL (for more details, please refer to [G
 - [GridWorld](./examples/gridworld/)
 - [Super Mario Bros](https://github.com/Kautenja/gym-super-mario-bros)
 - [Gym Retro](https://github.com/openai/retro)
+- [Crafter](https://github.com/danijar/crafter)
 
 This framework has undergone multiple iterations by the [OpenRL-Lab](https://github.com/OpenRL-Lab) team which has
 applied it in academic research.

README_zh.md

@@ -101,6 +101,7 @@ OpenRL目前支持的环境（更多详情请参考 [Gallery](Gallery.md)）：
 - [GridWorld](./examples/gridworld/)
 - [Super Mario Bros](https://github.com/Kautenja/gym-super-mario-bros)
 - [Gym Retro](https://github.com/openai/retro)
+- [Crafter](https://github.com/danijar/crafter)
 
 该框架经过了[OpenRL-Lab](https://github.com/OpenRL-Lab)的多次迭代并应用于学术研究，目前已经成为了一个成熟的强化学习框架。
 OpenRL-Lab将持续维护和更新OpenRL，欢迎大家加入我们的[开源社区](./docs/CONTRIBUTING_zh.md)，一起为强化学习的发展做出贡献。