LauncherICONを変更

	modified:   res/drawable-hdpi/ic_launcher.png
	modified:   res/drawable-mdpi/ic_launcher.png
	modified:   res/drawable-xhdpi/ic_launcher.png
	modified:   res/drawable-xxhdpi/ic_launcher.png
READMEの内容を追加

	modified:   README.md