Use Graphql ( Apollo server )

## Purpose

- With rest API, use graphql

## Why

- somebody want to use graphql

## TODO List

- use apollo server
- convert rest api to graphql

## Describe alternatives you've considered

- [rest api vs graph ql](https://www.holaxprogramming.com/2018/01/20/graphql-vs-restful-api/)

## Additional context

- I will use graphql in roubit server
