Initialisation

Added the packages and files for the backend server

node_modules/graphql/language/printString.d.ts

@@ -0,0 +1,5 @@
+/**
+ * Prints a string as a GraphQL StringValue literal. Replaces control characters
+ * and excluded characters (" U+0022 and \\ U+005C) with escape sequences.
+ */
+export declare function printString(str: string): string;