Add TODO comment to return user ID in finishAssertion

Author: vstanchev

src/main/java/com/helioauth/passkeys/api/service/UserSignInService.java

@@ -46,6 +46,7 @@ public SignInStartResponse startAssertion(String name) throws JsonProcessingExce
     @Transactional
     public String finishAssertion(String requestId, String publicKeyCredentialJson) {
         try {
+            // TODO return user id also
             CredentialAssertionResult result = webAuthnAuthenticator.finishAssertion(requestId, publicKeyCredentialJson);
 
             userCredentialRepository.updateUsageByUserHandleAndCredentialId(