add: 月团报名接口

mec-student/src/main/java/com/ym/mec/student/controller/RegisterController.java

@@ -27,7 +27,7 @@ public class RegisterController extends BaseController {
     @PostMapping("/add")
     public Object add(StudentRegistration studentRegistration) {
         studentRegistrationService.insert(studentRegistration);
-        return succeed();
+        return succeed(studentRegistration);
     }
 
     @ApiOperation(value = "通过乐团编号获取声部列表")