Support Carthage installation

[yuzushioh]

Issue/Task Number: Link

Overview

Supports SDK installation via Carthage.

Changes

• Create Carthage build of sdk
• Update README in installation section

Implementation Details

I make changes to support installation via Carthage.

Usage

1. Create Cartfile in some directory and add github "omisego/ios-sdk", then run carthage update --platform ios
2. This creates directory named Carthage and put the built framework in it.
3. Add the OmiseGo framework to the project and run.

Impact

None

[mederic-p]

Hi, thanks for contributing to the project!
It's nice to have a support for Carthage, however I don't think that we should include the built framework in the repo for now. as we're still in beta, we will be changing the code almost everyday and it doesn't really make sense.
Also I think that most of swift projects don't actually embed the built framework in the sources but instead let it compile when running carthage update --platform ios.
Can you please remove the Carthage folder for now and we will see if we need to add it later.
It'd be nice also to have the last step in the readme (drag the framework in the project).

[yuzushioh]

@mederic-p Thank you for the review.

I don't think that we should include the built framework in the repo for now. as we're still in beta, we will be changing the code almost everyday and it doesn't really make sense.

This makes total sense for me too. I removed the build framework from the repository.

most of swift projects don't actually embed the built framework in the sources

I meant to drag the framework to the project by embed the built framework. I changed it.

[mederic-p]

I'd put:
Drag the built OmiseGO.framework into your Xcode project.
For maximum clarity :)

[mederic-p]

Just a minor wording change

[yuzushioh]

@mederic-p fixed 👍