Update README.md

README.md

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 <p>
   <a href="#公众号"><img src="http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall/badge/%E5%85%AC%E4%BC%97%E5%8F%B7-macrozheng-blue.svg" alt="公众号"></a>
   <a href="#公众号"><img src="http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall/badge/%E4%BA%A4%E6%B5%81-%E5%BE%AE%E4%BF%A1%E7%BE%A4-2BA245.svg" alt="交流"></a>
+  <a href="https://github.com/macrozheng/mall-learning"><img src="http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall/badge/%E5%AD%A6%E4%B9%A0%E6%95%99%E7%A8%8B-mall--learning-green.svg" alt="学习教程"></a>
   <a href="https://github.com/macrozheng/mall"><img src="http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall/badge/%E5%90%8E%E5%8F%B0%E9%A1%B9%E7%9B%AE-mall-blue.svg" alt="后台项目"></a>
   <a href="https://github.com/macrozheng/mall-admin-web"><img src="http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall/badge/%E5%89%8D%E7%AB%AF%E9%A1%B9%E7%9B%AE-mall--admin--web-green.svg" alt="前端项目"></a>
   <a href="https://gitee.com/macrozheng/mall-swarm"><img src="http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall/badge/%E7%A0%81%E4%BA%91-%E9%A1%B9%E7%9B%AE%E5%9C%B0%E5%9D%80-orange.svg" alt="码云"></a>