feat: implement subscription endpoints in graphql

src/Hng.Graphql/Mutations.Subscriptions.cs

@@ -1,12 +1,28 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using Hng.Application.Features.Subscriptions.Commands;
+using Hng.Application.Features.Subscriptions.Dtos.Requests;
+using Hng.Application.Features.Subscriptions.Dtos.Responses;
+using HotChocolate.Authorization;
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
 
 namespace Hng.Graphql
 {
-    public class Mutations
+    public partial class Mutations
     {
+        [Authorize]
+        public async Task<SubscribeFreePlanResponse> SubscribeFreePlan(SubscribeFreePlan command, [FromServices] IMediator mediator)
+        {
+
+
+            return await mediator.Send(command);
+        }
+
+        [Authorize]
+        public async Task<SubscriptionDto> ActivateSubscription(Guid subscriptionId, [FromServices] IMediator mediator)
+        {
+            var command = new ActivateSubscriptionCommand(subscriptionId);
+            return await mediator.Send(command);
+        }
     }
-}
+}