Hilt: add small migration guide

docs/hilt_migration.md

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+Useful links:
+- https://dagger.dev/hilt/migration-guide
+- https://dagger.dev/hilt/quick-start
+
+Hilt is built on top of Dagger 2 and simplify usage by removing needs to create components manually.
+
+When you create a new feature, you should have the following:
+
+Annotate your Activity with @AndroidEntryPoint
+If you have a BottomSheetFragment => Annotate it with @AndroidEntryPoint
+Otherwise => Add your Fragment to the FragmentModule
+Add your ViewModel.Factory to the MavericksViewModelModule
+Makes sure your ViewModel as the following code:
+
+```
+ @AssistedFactory
+    interface Factory: MavericksAssistedViewModelFactory<MyViewModel, MyViewState> {
+        override fun create(initialState: MyViewState): MyViewModel
+    }
+
+    companion object : MavericksViewModelFactory<MyViewModel, MyViewState> by hiltMavericksViewModelFactory()
+```
+
+## Some remarks
+
+@MavericksViewModelScope dependencies can't be injected inside Fragments/Activities
+You can only inject @Singleton, @MavericksViewModelScope or unscoped dependencies inside Maverick ViewModels
+You can access some specific dependencies from Singleton component by using
+```
+context.singletonEntryPoint()
+```
+Be aware that only the app has been migrated to Hilt and not the SDK.
+