[ReactNative][Docs] Document how to link libraries

[tadeuzagallo]

Add some documentation on how to link the libraries that we built as independent xcode projects.

/cc @vjeux @a2

[JoeStanton]

s/we Ract Native/with React Native

[JoeStanton]

On the same sort of topic - I was going to have a stab at react-native new-library or similar, to generate a boilerplate XCode project to do Native bridging. Useful?

I found this a bit difficult/time consuming when writing RCTVibration with my limited XCode experience and it could encourage consistency and best practices around exports, docs etc.

It would make each plugin nicely npm publish-able without too much effort, for features that don't belong in core.

[tadeuzagallo]

Oh, I'll fix this typo, thanks!

The new-library might be a good idea! @frantic, what do you think?

[frantic]

The article looks good, but maybe still pretty complex for non-ios developer who sees Xcode for the first time. Would be nice to add a screenshot. Ideally we would do all the work using something like npm install <native-lib>, but having docs is better than not having docs :)

As for new-library - good point, however I think the skills you need to build native library should already include some experience with Xcode. Still worth doing though.