Initialisation

Added the packages and files for the backend server

node_modules/graphql/jsutils/isPromise.d.ts

@@ -0,0 +1,5 @@
+/**
+ * Returns true if the value acts like a Promise, i.e. has a "then" function,
+ * otherwise returns false.
+ */
+export declare function isPromise(value: any): value is Promise<unknown>;