Add composer.json for packagist

composer.json

@@ -28,10 +28,10 @@
   ],
   "scripts": {
     "post-update-cmd": [
-      "php vendor/oxusmedia/webapp/scripts/installassets.php ../assets"
+      "php protected/vendor/oxusmedia/webapp/scripts/installassets.php ../assets"
     ],
     "post-install-cmd": [
-      "php vendor/oxusmedia/webapp/scripts/installassets.php ../assets"
+      "php protected/vendor/oxusmedia/webapp/scripts/installassets.php ../assets"
     ]
   }
 }