chore: add additional instructions to the readme

Log:
Change-Id: I8ac1ead32ebd9e0c0c34397db243fbbd2de67b7d

Author: deepin-mozart

README.en.md

@@ -2,7 +2,7 @@
 
 [![zh](https://img.shields.io/badge/lang-zh-red.svg)](./README.md)
 
-deepin-ide is a lightweight integrated development environment, featured with multilingual and cross platform compatibility.
+deepin-ide (original name：deepin-unioncode) is a lightweight integrated development environment, featured with multilingual and cross platform compatibility.
 
 ## Build dependencies
 

README.md

@@ -2,7 +2,7 @@
 
 [![en](https://img.shields.io/badge/lang-en-red.svg)](./README.en.md)
 
-deepin-ide 是一款支持多语言、跨平台兼容特性的轻量级集成开发环境。
+deepin-ide (原名：deepin-unioncode) 是一款支持多语言、跨平台兼容特性的轻量级集成开发环境。
 
 ## 构建依赖