Create OrderViewModel

app/src/main/java/com/example/cupcake/model/OrderViewModel.kt

+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class OrderViewModel : ViewModel() {
+    private val _quantity = MutableLiveData<Int>(0)
+    val quantity: LiveData<Int> = _quantity
+
+    private val _flavor = MutableLiveData<String>("")
+    val flavor: LiveData<String> = _flavor
+
+    private val _date = MutableLiveData<String>("")
+    val date: LiveData<String> = _date
+
+    private val _price = MutableLiveData<Double>(0.0)
+    val price: LiveData<Double> = _price
+
+    fun setQuantity(numberCupcakes: Int) {
+        _quantity.value = numberCupcakes
+    }
+
+    fun setFlavor(desiredFlavor: String) {
+        _flavor.value = desiredFlavor
+    }
+
+    fun setDate(pickupDate: String) {
+        _date.value = pickupDate
+    }
+}
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