Update readme files

README.md

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 ![GitHub code size in bytes](https://img.shields.io/github/languages/code-size/axmolengine/axmol?style=plastic)  
 
 
-> ⚠️⚠️⚠️ NOTICE ⚠️⚠️⚠️
->
-> This branch still at an early develop phase, and the main goals is:
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-> - OpenGL3/GLES3 support
-> - The GLES2 support was dropped
-> - Mesh instancing draw support
-> - Use glslcc as shader workflow, write shader by ESSL310, build to target platforms: MSL for Apple(macOS/iOS/tvOS), ESSL300 for Android, ANGLE, GLSL330 for Desktop GL
-> - Improve ProgramManager for loading custom shader program more easy
-> - Improve text rendering, SDF outline support
-> - Improve FileStream, handle large 4GB+ files
-> - Many other improvements: refer to [#1279](https://github.com/axmolengine/axmol/issues/1279)
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-
 **[简体中文](README_CN.md)**
 
 ## Supported Platforms

README_CN.md

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 [![QQ Group](https://img.shields.io/badge/QQGroup-join-green.svg)](https://jq.qq.com/?_wv=1027&k=nvNmzOIY)
 
 
-> ⚠️⚠️⚠️ NOTICE ⚠️⚠️⚠️
->
-> 本分支处于早期开阶段, 主要目标是:
-
-> - OpenGL3/GLESv3支持
-> - 废弃GLES2设备支持
-> - Mesh实例化渲染支持
-> - 使用`glslcc`作为新的引擎着色器工作流，开发者使用ESSL310或GLSL450语法编写shader, 引擎自动使用`glslcc`编译为目标支持平台语法： 
->   - Desktop GL: GLSL330
->   - GLESv3: ESSL300
->   - Metal: MSL
-> - 增强shader缓存管理和加载机制，加载API更加易用
-> - 增强文本渲染, 增加SDF outline支持
-> - 增强FileStream, 使之能处理大文件，FileUtils::getContents在所有平台都基于FileStream读取文件
-> - 其他更多优化，请查看: [#1279](https://github.com/axmolengine/axmol/issues/1279)
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-
 **[English](README.md)** 
 
 ## 支持平台列表