Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/UniqueVariableNamesRule.d.ts

@@ -0,0 +1,10 @@
+import type { ASTVisitor } from '../../language/visitor';
+import type { ASTValidationContext } from '../ValidationContext';
+/**
+ * Unique variable names
+ *
+ * A GraphQL operation is only valid if all its variables are uniquely named.
+ */
+export declare function UniqueVariableNamesRule(
+  context: ASTValidationContext,
+): ASTVisitor;