add readme file and preview gif

LICENSE

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+MIT License
+
+Copyright (c) 2016 小闹钟
+
+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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+# 微信小程序 Demo （小熊の日记）
+
+我是一名后端程序员，做这个仅仅是因为觉得微信小程序好玩；没有明确的产品意图，东抄抄西抄抄只是为了验证和学习微信小程序；大体是想做一个个人/家庭日常记录的app，目前仍在开发中，有兴趣请持续关注咯^ ^
+
+另，这个项目所用到的所有前端知识都是我做小程序期间从零开始补的，有好多可能并不符合Best practice，希望大家能指正；我本人并不热衷于做开源项目，这个确实算个例外。
+
+## 这个Demo有什么不一样？
+
+1. 希望最终是一个功能完善的app，而不仅仅是展示列表和详情，所以你们可以看到这个app有写入功能；
+2. 微信提供的组件目前还有很大缺陷，有些功能尚不能优雅的实现，然而这个项目会在不完美的微信组件上完成某些功能（比如文本编辑器）；
+
+...
+
+## Demo 预览
+
+<p align="center">
+    <img src="./files/preview.gif" alt="小熊の日记" width="100%">
+</p>
+
+## 使用步骤
+
+1. 克隆代码:
+
+```bash
+$ git clone https://github.com/harveyqing/BearDiary.git
+$ cd BearDiary
+```
+
+2. 打开`微信Web开放者工具`（注意：必须是`0.9.092300`版本）
+
+3. 添加项目
+
+4. 你喜欢就好
+
+## 未完待续...
+
+## LICENSE
+
+[MIT](./LICENSE)
+
+
+