return userId upon login

src/main/java/application/controllers/UserController.java

@@ -57,6 +57,7 @@ public class UserController {
             if(login.equals(user.getEmail()) && password.equals(user.getPassword())){
                 userFound = true;
                 loginResponse.put("success", true);
+                loginResponse.put("userId", user.getUserId());
 
                 //access codes
                 JSONArray accessCodes = new JSONArray();