<?xml version='1.0' encoding='utf-8'?>
<widget>
<icon src="www/res/drawable-xxxhdpi/icon.png" />
<platform name="android">
<icon src="www/res/drawable-ldpi/icon.png" density="ldpi" />
<icon src="www/res/drawable-mdpi/icon.png" density="mdpi" />
<icon src="www/res/drawable-hdpi/icon.png" density="hdpi" />
<icon src="www/res/drawable-xhdpi/icon.png" density="xhdpi" />
</platform>
<platform name="ios">
<!-- iOS 7.0+ -->
<!-- iPhone / iPod Touch -->
<icon src="www/res/ios/icon-60.png" width="60" height="60" />
<icon src="www/res/ios/[email protected]" width="120" height="120" />
<!-- iPad -->
<icon src="www/res/ios/icon-76.png" width="76" height="76" />
<icon src="www/res/ios/[email protected]" width="152" height="152" />
<!-- iOS 6.1 -->
<!-- Spotlight Icon -->
<icon src="www/res/ios/icon-40.png" width="40" height="40" />
<icon src="www/res/ios/[email protected]" width="80" height="80" />
<!-- iPhone / iPod Touch -->
<icon src="www/res/ios/icon.png" width="57" height="57" />
<icon src="www/res/ios/[email protected]" width="114" height="114" />
<!-- iPad -->
<icon src="www/res/ios/icon-72.png" width="72" height="72" />
<icon src="www/res/ios/[email protected]" width="144" height="144" />
<!-- iPhone Spotlight and Settings Icon -->
<icon src="www/res/ios/icon-small.png" width="29" height="29" />
<icon src="www/res/ios/[email protected]" width="58" height="58" />
<!-- iPad Spotlight and Settings Icon -->
<icon src="www/res/ios/icon-50.png" width="50" height="50" />
<icon src="www/res/ios/[email protected]" width="100" height="100" />
</platform>
</widget>Another interesting answer (icons, splashscreen): http://stackoverflow.com/questions/17820492/how-to-add-app-icon-within-phonegap-projects/31674547#31674547
Hook to copy icons to the compiled project: http://devgirl.org/2013/11/12/three-hooks-your-cordovaphonegap-project-needs/