add license, move folders

app/scripts/api/backend.gd

@@ -0,0 +1,19 @@
+extends Node
+#class_name Backend
+
+
+func request(url: String, callback: Callable,
+		body: Dictionary = {}, method: int = HTTPClient.METHOD_GET) -> Error:
+	var data = JSON.stringify(body)
+	var headers = []
+	
+	var http = HTTPRequest.new()
+	http.use_threads = true
+	add_child(http)
+	
+	var err = http.request(url, headers, method, data)
+	var res = await http.request_completed
+	callback.call(res[0], res[1], res[2], res[3])
+	remove_child(http)
+	
+	return err