Add design support library docs
Add design support library docs

BUG: 20524332
Change-Id: I471ab17a2a5ccc43f4ef0fa04b7c2e9077d56361
(cherry picked from commit 8f168d1b986516112d103958070830c9075f6ce2)

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build