add content to README

README.md

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 # deltachat-ios
 Email-based instant messaging for iOS.
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+- after cloning, go to the top level directory of the project and run 'pod install' (Cocoapods is a dependency manager for Xcode). See https://guides.cocoapods.org/using/getting-started.html
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+- then, open deltachat-ios.xcworkspace (*not* deltachat-ios.xcodeproj ), e.g. by typing 'open deltachat-ios.xcworkspace' from the shell. Will add some basic instructions in the README soon
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