docs: update README.md with WSO2 API Manager token usage and Apollo C…

…lient documentation reference

README.md

@@ -70,6 +70,10 @@ const client = new ApolloClient({
 });
 ```
 
+- Replace the `authorization` header with the actual token generated by the WSO2 API Manager.
+
+- Refer the [Apollo Client Documentation](https://www.apollographql.com/docs/react/get-started/) for more information on how to connect Apollo Client to a GraphQL API.
+
 4. **Run the application**  
 - Navigate to the project directory and run the following command to start the server.
 ```