[+] maimai user summary

src/main/java/ext/Ext.kt

@@ -0,0 +1,7 @@
+package ext
+
+import org.springframework.http.HttpStatus
+import org.springframework.web.server.ResponseStatusException
+
+// Make it easier to throw a ResponseStatusException
+operator fun HttpStatus.invoke(message: String? = null): Nothing = throw ResponseStatusException(this, message ?: this.reasonPhrase)