add Order Entity and API Basics

public/bundles/apiplatform/init-graphql-playground.js

@@ -0,0 +1,12 @@
+window.addEventListener('load', function(event) {
+    var loadingWrapper = document.getElementById('loading-wrapper');
+    loadingWrapper.classList.add('fadeOut');
+
+    var root = document.getElementById('graphql-playground');
+    root.classList.add('playgroundIn');
+
+    var data = JSON.parse(document.getElementById('graphql-playground-data').innerText);
+    GraphQLPlayground.init(root, {
+        'endpoint': data.entrypoint
+    })
+});