Create a manual dependency injection

[endruuu]

Create a manual dependency injection.

Normally we use Dagger or Koin for dependency injection. However, it turns out that:

• Using Dagger, we need to ask users initialize the dependency injection within their Application file; or
• Using Koin, we need to ask users install the Koin library within their module.

Since they are not possible, I just created a very simple manual dependency injection. Usage:

// Initialize DI
val iterateDI = IterateDI(context)

// To get the repository
iterateDI.iterateRepository

Reference: https://developer.android.com/training/dependency-injection/manual#dependencies-container

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I checked that Stripe uses Dagger, but it doesn't enforce users to initialize the dependency injection within their Application file. Let me check it again later. I will close this PR first.