I merged Core PR. With it it comes unification of project strucure.

We have

• Core
  
• Core.Platform.Android/
• Core.Platform.iOS/
• Core.Platform.NuGet/
• Core.Platform.Shared/
• Core.Tests/
• Auth
  
• Auth
• Auth.Tests
• Auth.Platform.Android
• Auth.Platform.iOS
• Example
  
• Example/
• Example.Android/
• Example.iOS/
• Documentation

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