chore: refactor the internal structure (#33)

Reviewed-on: https://git.reya.su/reya/coop-mobile/pulls/33

shared/src/commonMain/kotlin/su/reya/coop/viewmodel/BaseViewModel.kt

@@ -0,0 +1,10 @@
+package su.reya.coop.viewmodel
+
+import androidx.lifecycle.ViewModel
+import su.reya.coop.repository.ErrorRepository
+
+abstract class BaseViewModel : ViewModel() {
+    protected fun showError(message: String) {
+        ErrorRepository.showError(message)
+    }
+}