Add license and contributing

CONTRIBUTING.md

@@ -0,0 +1,9 @@
+## Contribution Guide
+
+> Every technology is welcomed as long as they are maintainable. Let's build our todo app together~!
+
+[iOS]
+- Swift UI
+
+[Android]
+- Jetpack Compose

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 hyochan
+
+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

@@ -1,5 +1,7 @@
 # TodoMagic
 
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](CONTRIBUTING.md)
+
 > This project aims to share useful tutorials with other developers around the world. SwiftUI and Jetpack Compose.
 
 ![image](https://user-images.githubusercontent.com/27461460/77463970-d1d0a000-6e49-11ea-84f3-315350b7f8bd.png)