improve login and add migration script

src/dtos/LoginRequestDto.ts

@@ -0,0 +1,7 @@
+/**
+ * Defines a login request
+ */
+export class LoginRequestDto {
+    userName: string;
+    password: string;
+}

src/dtos/LoginResponseDto.ts

@@ -0,0 +1,9 @@
+import { UserDto } from "./UserDto";
+
+/**
+ * Response  to a successful login
+ */
+export class LoginResponseDto {
+    userData: UserDto;
+    token: string;
+}