refactor: Modify LoginDto (#3)

Author: youjin09222

server-toy-project/src/main/java/com/gdsc_teamb/servertoyproject/login/LoginDto.java

@@ -0,0 +1,12 @@
+package com.gdsc_teamb.servertoyproject.login;
+
+import lombok.*;
+
+@Getter
+@Setter
+@ToString
+@Builder
+public class LoginDto {
+    private String memberId;
+    private String password;
+}