Add state reactive variables

src/graphql/state.ts

@@ -1 +1,10 @@
-export {};
+import { makeVar } from '@apollo/client';
+import { UserResponseModel } from './types';
+
+export const tokenVar = makeVar<string | undefined>(undefined);
+
+export const roleVar = makeVar<
+  'client' | 'productOwner' | 'developer' | 'admin' | undefined
+>(undefined);
+
+export const userVar = makeVar<UserResponseModel | undefined>(undefined);