Adding inventory microservice

microservices/InventoryApi/Models/InventoryMutationResult.cs

@@ -0,0 +1,22 @@
+namespace InventoryApi.Models;
+
+public enum InventoryMutationStatus
+{
+    Ok,
+    ItemNotFound,
+    Invalid,
+    Conflict
+}
+
+public class InventoryMutationResult
+{
+    public InventoryMutationStatus Status { get; init; } = InventoryMutationStatus.Ok;
+
+    public string OwnerType { get; init; } = string.Empty;
+
+    public string OwnerId { get; init; } = string.Empty;
+
+    public List<InventoryItem> Items { get; init; } = [];
+
+    public static implicit operator InventoryMutationStatus(InventoryMutationResult result) => result.Status;
+}