implemented QR code tips controller, delete email message, delete all email messages

src/main/java/com/safeqr/app/gmail/dto/BaseResponse.java

@@ -0,0 +1,12 @@
+package com.safeqr.app.gmail.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+@AllArgsConstructor
+public class BaseResponse {
+    private String message;
+}