add DQN

codes/DQN/README.md

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+## 思路
+
+见[我的博客](https://blog.csdn.net/JohnJim0/article/details/109557173)
+## 环境
+
+python 3.7.9
+
+pytorch 1.6.0
+
+tensorboard 2.3.0 
+
+torchvision 0.7.0 
+
+## 使用
+
+train: 
+
+```python
+python main.py 
+```
+
+eval: 
+
+```python
+python main.py --train 0 
+```
+可视化：
+```python
+tensorboard --logdir logs 
+```
+
+## Torch知识
+
+[with torch.no_grad()](https://www.jianshu.com/p/1cea017f5d11)
+