chore(composer.json): setup composer autoloader

Author: fadrian06

composer.json

@@ -66,5 +66,10 @@
         "psr-4": {
             "Tests\\": "tests"
         }
+    },
+    "autoload": {
+        "psr-4": {
+            "app\\": "app"
+        }
     }
 }