Add README

README.md

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+<p align="center">
+<img src="graphics/icon/ic_launcher_web.png" height="60px" width="60px"/>
+</p>
+
+<h3><p align="center">Timetable</p></h3>
+
+<p align="center"><i>A super simple timetable app</i></p>
+
+![](graphics/screenshots/readme.png)
+
+<p align="right">
+<a href='https://github.com/xiprox/Youkai/releases/latest'><img height="48" alt='Get apk' src='https://cloud.githubusercontent.com/assets/2550945/21590907/dd74e0f0-d0ff-11e6-971f-d429148fd03d.png'/></a>
+</p>
+
+## What is this?
+This is a very simple timetable app I crafted for my personal use. It works with JSON data stored in the assets folder.
+
+## Can I use it too?
+Yes. However, you will have to fork the project, change the data, and rebuild the app. You can either update the [JSON file](https://github.com/xiprox/Timetable/blob/master/app/src/main/assets/timetable.json) directly or create a copy of [this](https://docs.google.com/spreadsheets/d/1LStBwnFAdI6i9WK33_AZ0QXDIASUvgBCzDIgKDlHl3Q) spreadsheet and then convert the data to JSON (you can use [Mr. Data Converter](https://shancarter.github.io/mr-data-converter)).
+
+## License
+```
+Copyright (C) 2017  İhsan Işık
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+```
+GPL v3 ([LICENSE](/LICENSE))