Update README.md

MilkyBoat · Dec 31, 2020 · 15d9742 · 15d9742
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 # 如何使用
 
+> 请先参照本代码库根目录下的util.pdf安装配置环境，需要在Linux上使用，需要安装gcc(g++), flex, bison, qemu等工具
+
 ```bash
 git clone https://github.com/MilkyBoat/compilor_experiment.git
 cd compilor_experiment/lab6