docs(projects): set the Chinese version of README as default

Author: honghuangdc

README.zh_CN.md renamed to README.en_US.md

@@ -1,7 +1,7 @@
 <div align="center">
 	<img src="./public/favicon.svg" width="160" />
 	<h1>SoybeanAdmin</h1>
-  <span><a href="./README.md">English</a> | 中文</span>
+  <span>中文 | <a href="./README.en_US.md">English</a></span>
 </div>
 
 ---

README.md

@@ -1,7 +1,7 @@
 <div align="center">
 	<img src="./public/favicon.svg" width="160" />
 	<h1>SoybeanAdmin</h1>
-  <span>English | <a href="./README.zh_CN.md">中文</a></span>
+  <span><a href="./README.md">中文</a> | English</span>
 </div>
 
 ---