feat: improve document and close #199

README.md

@@ -4,6 +4,8 @@
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+[![github](https://badgen.net/badge/⭐/GitHub/blue)](https://github.com/doocs/advanced-java)
+[![gitee](https://badgen.net/badge/⭐/Gitee/blue)](https://gitee.com/doocs/advanced-java)
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