Update HashtagFollowController, add store method

app/Http/Controllers/HashtagFollowController.php

@@ -3,8 +3,48 @@
 namespace App\Http\Controllers;
 
 use Illuminate\Http\Request;
+use Auth;
+use App\{
+	Hashtag,
+	HashtagFollow,
+	Status
+};
 
 class HashtagFollowController extends Controller
 {
-    //
+    public function __construct()
+    {
+    	$this->middleware('auth');
+    }
+
+    public function store(Request $request)
+    {
+    	$this->validate($request, [
+    		'name' => 'required|alpha_num|min:1|max:124|exists:hashtags,name'
+    	]);
+
+    	$user = Auth::user();
+    	$profile = $user->profile;
+    	$tag = $request->input('name');
+
+    	$hashtag = Hashtag::whereName($tag)->firstOrFail();
+
+        $hashtagFollow = HashtagFollow::firstOrCreate([
+            'user_id' => $user->id,
+            'profile_id' => $user->profile_id ?? $user->profile->id,
+            'hashtag_id' => $hashtag->id
+        ]);
+
+        if($hashtagFollow->wasRecentlyCreated) {
+            $state = 'created';
+            // todo: send to HashtagFollowService
+        } else {
+            $state = 'deleted';
+            $hashtagFollow->delete();
+        }
+
+        return [
+            'state' => $state
+        ];
+    }
 }