Add offline support using Room
Jovche Mitrejchevski

Hi, personally I do not understand why RxJava is here, just for simplicity? But you are using `postValue`, subscribeOn and observeOn on the same scheduler, so basically there is no single excuse for rxjava in this sample☺ If you want something light for compact code check kotlin coroutines for retrofit. Also that standard Callable/Call interface is not that big.

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