se agrego el id a la respuesta de CreatePost

Tsi1.Api/Tsi1.Api/Controllers/PostController.cs

@@ -71,7 +71,7 @@ namespace Tsi1.Api.Controllers
                 }
             }
             
-            return Ok();
+            return Ok(result.Data.Id);
         }
 
         [Authorize(Roles = UserTypes.Student + ", " + UserTypes.Professor)]