[ADD] Carthage Installation Guide on ReadMe file

[bishalg]

Added Instructin to install Carthage and more steps on Cocopods Installation

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[grp]

Rather than explain how to use the tools, could we link to the documentation of the tools themselves? That also makes sure it stays up to date even if the tool usage changes.

[bishalg]

@grp : I have seen most of the iOS framework adding Installation guide of carthage and cocoapod directly into main ReadMe file. In some reare case where the main ReadMe is huge they tend to add separate installation guide.
example of some popular Swift frameworks -

• Alamofire - https://github.com/Alamofire/Alamofire#installation
• SwiftyJSON - https://github.com/SwiftyJSON/SwiftyJSON#integration

[grp]

I tend to have an optimistic view that people would already know how to use their tools. :)

[antonino-u]

Unless I'm missing something, it seems that even on the latest stable Carthage 0.30.1, Shimmer can't be build by Carthage because Dependency "Shimmer" has no shared framework schemes.

[bishalg]

@antonino-u: there has been no development to the project in last 2 years so I don't think Carthage support would be possible, the only solution seems to be forking the project and maintaining it manually.