Update README.md

Perfare · web-flow · commit 769f959857b2 · 2019-10-23T06:56:46.000+08:00
diff --git a/README.md b/README.md
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 # UnityLive2DExtractor
-Unity Live2D Cubism 3 Extractor
+Unity Live2D Cubism 3 提取器  
+用于提取Unity AssetBundle打包的Live2D Cubism 3文件  
+使用方法：拖放Live2D文件到exe上  
+Usage: UnityLive2DExtractor.exe file_path...  
