🎉 update readme.md

README.md

-# java-learning-demos
+# java-learning-demos
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+
+## [mybatis-generator-demo](https://github.com/cunyu1943/java-learning-demos/tree/main/mybatis-generator-demo)
+
+MyBatis Generator 代码生成器，配套教程：[MyBatis Generator 代码自动生成器，从此解放你的双手](https://blog.csdn.net/github_39655029/article/details/121927666)
+