Initial empty repository
Initial Flint Sender SDK for iOS.

Change-Id: I2dedaa2d5fad8dcf7913f7f4fb7d382b0f78cee0
Signed-off-by: Bao Zhen <bz@infthink.com>
Update iOS sender SDK docs.

Signed-off-by: Bao Zhen <bz@infthink.com>