News letter subscription added

app/Http/Controllers/API/NewsLetterAPIController.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Controllers\API;
+
+use Illuminate\Http\Request;
+use App\Http\Controllers\Controller;
+use App\NewsLetter;
+use Illuminate\Http\JsonResponse;
+
+class NewsLetterAPIController extends Controller
+{
+    /**
+     * Subscribe to the news
+     *
+     * @param  mixed $request
+     * @return JsonResponse
+     */
+    public function store(Request $request): JsonResponse
+    {
+        NewsLetter::create($request->validate([
+            "email" => "required|email|unique:news_letters"
+        ], ["email.unique" => "You are already subscribed to our newsletter!"]));
+
+        return response()->json([
+            "status" => "success",
+            "message" => "You have successfully subscribed to our newsletter!"
+        ]);
+    }
+}

app/Http/Controllers/API/TopicsAPIController.php

@@ -29,9 +29,9 @@ class TopicsAPIController extends Controller
      */
     public function show(Topic $topic)
     {
-        return [
+        return response()->json([
             'topic' => new TopicResource($topic),
             'articles' => $topic->articles()->with('source')->latest('published_date')->paginate(8)
-        ];
+        ]);
     }
 }