Create Podfile.

Podfile is a text file listing of the project dependencies. More info: https://github.com/CocoaPods/CocoaPods#readme
Run `pod install` in the project's directory.

Prerequisite: Cocoapods installed, see https://github.com/CocoaPods/CocoaPods#installation

Important: From now on use `UploadcareTutorial.xcworkspace'.
Present UPCUploadController instance.
Provide an upload delegate, conforming to UPCUploadDelegate protocol.