Update README.md

Author: limingth

README.md

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+# 2022 秋季 OS 训练营 
+## Rustlings 集训班 github classroom 地址：<https://classroom.github.com/a/U37u3veU>
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 # rustlings 🦀❤️
 
 Greetings and welcome to `rustlings`. This project contains small exercises to get you used to reading and writing Rust code. This includes reading and responding to compiler messages!