How to adding a new class file to cocos engine?

cocos2d-x
#1

I created a new feature class file for cocos engine. and I want to add a file to cocos engine.

Actually, when I create a new project with command, ‘cocos new MyGame…’, I want to include the newly added file.

#2

I found a information file. This file name is ‘coco2dx_files.json’.