添加 后端启动环境

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+首先创建venv：
+
+```jsx
+python -m venv venv
+```
+
+然后进入：
+
+```jsx
+.\venv\Scripts\Activate
+```
+
+升级pip和setuptools
+
+```jsx
+python -m pip install --upgrade pip -i https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple
+
+python -m pip install --upgrade setuptools -i https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple
+```
+
+安装依赖
+
+```jsx
+python.exe -m pip install -r requirements.txt -i https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple
+```
+
+全程使用清华源，需要关闭代理