Initialisation

Added the packages and files for the backend server

node_modules/graphql/jsutils/groupBy.d.ts

@@ -0,0 +1,7 @@
+/**
+ * Groups array items into a Map, given a function to produce grouping key.
+ */
+export declare function groupBy<K, T>(
+  list: ReadonlyArray<T>,
+  keyFn: (item: T) => K,
+): Map<K, ReadonlyArray<T>>;