已经从github下载并安装了2.3版本的tool_setup，按照乐鑫B站上一个教程也能够编译和下载到板子上了，但是都是在idf里面的工程的，如果想要在任意路径上放一个工程，则不能编译下载成功，请问要如何配置环境变量？
example里面readme写到：
Each example is a standalone project. The examples *do not have to be inside the esp-idf directory*. You can copy an example directory to anywhere on your computer in order to make a copy that you can modify and work with.
The `IDF_PATH` environment variable is the only thing that connects the example to the rest of ESP-IDF.
If you're looking for a more bare-bones project to start from, try [esp-idf-template](https://github.com/espressif/esp-idf-template).
请问要如何配置，能否给出详细步骤，谢谢