Update README.md

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Author: kshoji

README.md

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 # javax.sound.midi-for-Android
+[![Build Status](https://travis-ci.org/kshoji/javax.sound.midi-for-Android.svg?branch=master)](https://travis-ci.org/kshoji/javax.sound.midi-for-Android)
 
 This library is a porting of Java `javax.sound.midi` package.
 It's used with `USB MIDI Driver` project or `BLE MIDI for Android` project.
 
 Using this library, the existing Java MIDI project can be ported to Android app easily.
+
+Usage of the library
+--------------------
+
+For the detail, see the [wiki](https://github.com/kshoji/javax.sound.midi-for-Android/wiki).
+
+LICENSE
+=======
+[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)