Add frontend creation game (#13)

Reviewed-on: #13

src/GameIdeas/Client/GameIdeas.BlazorApp/Pages/Games/Gateways/GameGateway.cs

@@ -0,0 +1,24 @@
+using GameIdeas.BlazorApp.Services;
+using GameIdeas.BlazorApp.Shared.Constants;
+using GameIdeas.BlazorApp.Shared.Exceptions;
+using GameIdeas.Resources;
+using GameIdeas.Shared.Dto;
+
+namespace GameIdeas.BlazorApp.Pages.Games.Gateways;
+
+public class GameGateway(IHttpClientService httpClientService) : IGameGateway
+{
+    public async Task<CategoriesDto> FetchCategories()
+    {
+        try
+        {
+            var result = await httpClientService.FetchDataAsync<CategoriesDto>(Endpoints.Category.AllCategories);
+                
+            return result ?? throw new InvalidOperationException(ResourcesKey.ErrorFetchCategories);
+        }
+        catch (Exception)
+        {
+            throw new CategoryNotFoundException(ResourcesKey.ErrorFetchCategories);
+        }
+    }
+}