Creates a new mobile device group by ID

<mobile_device_group>
	<name>Sample Group</name>
	<is_smart>true</is_smart>
	<criteria>
		<criterion>
			<name>Last Inventory Update</name>
			<priority>0</priority>
			<and_or>and</and_or>
			<search_type>more than x days ago</search_type>
			<value>7</value>
			<opening_paren>false</opening_paren>
			<closing_paren>false</closing_paren>
		</criterion>
	</criteria>
	<site>
		<id>-1</id>
		<name>None</name>
	</site>
</mobile_device_group>