问请给我一个链接或指南如何添加自定义API，控制器，模型和迁移到我创建的简单Laravel包？

EN

    "name": "test/greetr",
    "description": "Greetr - A simple Laravel package.",
    "type": "project",
    "license": "MIT",
    "authors": [
        {
            "name": "Test Package",
            "email": "test_package@test.com"
        }
    ],
    "minimum-stability": "dev",
    "autoload": {
        "psr-4": {
            "Test\\Greetr\\": "src/"
        }
    },
    "require": {}
}```


**Here is the class.**

```<?php

public function greet(String $sName)

{

    return 'Hi ' . $sName . '! How are you doing today?';

}