Add ISC license

LICENSE

@@ -0,0 +1,5 @@
+Copyright (c) 2016-present David Dai
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md

@@ -5,8 +5,12 @@
 [kityminder-editor](https://github.com/fex-team/kityminder-editor) 的 Electron 封装，支持文件打开，保存，另存为；  
 同时支持导出到 JSON, txt, Markdown, SVG 及 PNG 格式。
 
-# 运行方法
+## 运行方法
 
 1. 安装全局依赖：`yarn global add bower`
 2. 安装依赖：`yarn install`
 3. 运行：`yarn start`
+
+## License
+
+[ISC](https://opensource.org/licenses/ISC)