README: added info about CocoaPods.
README: added info about CocoaPods.
Estimote/iOS-Indoor-SDK,4talesa/iOS-Indoor-SDK,4talesa/iOS-Indoor-SDK,liubq919/iOS-Indoor-SDK,dillera/iOS-Indoor-SDK,pcdamazo/iOS-Indoor-SDK,SmartDust/iOS-Indoor-SDK,dillera/iOS-Indoor-SDK