Dev Guide:Mobile SDK for LDS

Hey Greg,

Here's the section for the Mobile SDK feature for LDS. Please let me know if there are any modifications or additions that need to be made to the document. I covered the three main feautres we discussed. I also sent you an email in regards to a couple potential bugs I found during testing. Thanks!

@jhinkey

https://issues.liferay.com/browse/LRDOCS-964