title: Add IOS capability programmatically in Cordova plugin
body: <p>I have developed a plugin for Cordova IOS, for using App Groups.</p>
  
  <p>The plugin needs to activate App Groups Capability under <code>Targets</code> -> <code>Capabilities</code> in <strong>XCode</strong> and select one of the <code>App Groups</code>.</p>
  
  <p>If I activate it manually, it works well, but I would like to activate it programmatically, well in <code>plugin.xml</code>, or with a custom hook.</p>
  
  <p>Somebody have achieved that?</p>