Add readme and license

Author: YooLc

LICENSE

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+MIT License
+
+Copyright (c) 2023 YooLc, bugByteMe
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Lyther 轻羽
+浙江大学 2023 春夏学期《程序设计专题》大作业
+
+基于 libgraphics 的轻量级 C 代码编辑器
+
+<div align=center>
+<img src="./docs/lyther.png" width = "200" alt="icon">
+</div>
+
+<div align=center>
+<b>Lyther 轻羽</b>
+</div>
+
+<div align=center>
+<img src="https://img.shields.io/github/directory-file-count/YooLc/Lyther-C" alt="file count">
+<img src="https://img.shields.io/github/license/YooLc/Lyther-C" alt="license">
+<img src="https://img.shields.io/github/last-commit/YooLc/Lyther-C" alt="last commit">
+</div>
+
+# 使用文档
+将项目克隆之本地，使用 Dev-C++ 打开项目文件 `/prjdev/CodeEditor.dev` 即可编译运行，
+亦可以对项目进行编辑
+
+有关本项目的更多信息，如选题背景，需求分析，程序开发设计，
+部署运行说明以及团队合作记录，**或者只是看看我们做的什么样子**，请参见 [互评文档](docs/lyther-documentation.pdf)