fix: add type hints to achievements

app/Achievements/UserMadeFirstPost.php

@@ -17,13 +17,17 @@ use Assada\Achievements\Achievement;
 
 class UserMadeFirstPost extends Achievement
 {
-    /*
-     * The achievement name
+    /**
+     * The achievement name.
+     *
+     * @var string
      */
     public $name = 'FirstPost';
 
-    /*
-     * A small description for the achievement
+    /**
+     * A small description for the achievement.
+     *
+     * @var string
      */
     public $description = 'Congratulations! You have made your first post!';
 }