Add app icon, close #11

config.xml

@@ -19,6 +19,13 @@
         <preference name="HeaderColor" value="#324150"/>
         <preference name="StatusBarBackgroundColor" value=""/>
         <allow-intent href="market:*"/>
+
+        <icon background="res/android/mipmap-mdpi/ic_launcher_background.png" density="mdpi" foreground="res/android/mipmap-mdpi/ic_launcher_foreground.png" src="res/android/mipmap-mdpi/ic_launcher.png" />
+        <icon background="res/android/mipmap-hdpi/ic_launcher_background.png" density="hdpi" foreground="res/android/mipmap-hdpi/ic_launcher_foreground.png" src="res/android/mipmap-hdpi/ic_launcher.png" />
+        <icon background="res/android/mipmap-xhdpi/ic_launcher_background.png" density="xhdpi" foreground="res/android/mipmap-xhdpi/ic_launcher_foreground.png" src="res/android/mipmap-xhdpi/ic_launcher.png" />
+        <icon background="res/android/mipmap-xxhdpi/ic_launcher_background.png" density="xxhdpi" foreground="res/android/mipmap-xxhdpi/ic_launcher_foreground.png" src="res/android/mipmap-xxhdpi/ic_launcher.png" />
+        <icon background="res/android/mipmap-xxxhdpi/ic_launcher_background.png" density="xxxhdpi" foreground="res/android/mipmap-xxxhdpi/ic_launcher_foreground.png" src="res/android/mipmap-xxxhdpi/ic_launcher.png" />
+
     </platform>
     <platform name="ios">
         <allow-intent href="itms:*"/>