RECOMMENDED READING
Develop apps for SharePoint — http://msdn.microsoft.com/en-us/library/jj163794(v=office.15).aspx
App permissions in SharePoint 2013 — http://msdn.microsoft.com/en-us/library/fp142383(v=office.15).aspx
App for SharePoint UX design guidelines — http://msdn.microsoft.com/en-us/library/jj220046(v=office.15).aspx
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