Add LICENSE

LICENSE.txt

@@ -0,0 +1,41 @@
+许可证与版权
+
+1. chsrc 主程序采用 GPLv3 许可证，保证该软件的永久自由。
+2. xy.h  文件单独采用 MIT 许可证，保证该迷你库可以在尽可能多的情况下复用。
+
+使用 xy.h 全部或部分源代码，仅要求您在您的软件中包含此文件下方的 MIT 部分，以说明许可证和版权信息。
+
+而使用 chsrc 的代码，则要求您履行 GPLv3 的所有条件。
+
+
+---
+GNU GENERAL PUBLIC LICENSE Version 3 (GPLv3)
+
+Copyright (c) 2023-present 曾奥然 (Aoran Zeng), 郭恒 (Heng Guo). All rights reserved.
+
+See: https://www.gnu.org/licenses/gpl-3.0.html
+
+
+---
+MIT License
+
+Copyright (c) 2023-present 曾奥然 (Aoran Zeng), 郭恒 (Heng Guo). All rights reserved.
+
+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.