#17: update userDetails mode

src/app/shared/models/user-details.ts

 export interface UserDetails {
   firstName: string;
-  lastName: string;
+  lastName?: string;
   emailId: string;
+  userId?: string;
   username: string;
-  password: string;
+  password?: string;
   active?: boolean;
   lastLogin?: string;
   created?: string;