mkdir public/uploads
mkdir config
config 폴더 안에 config.js 생성
module.exports = {
server_port: YOUR_SERVER_PORT,
server_url:'YOUR_SERVER_IP',
db_uri: YOUR_DB_URI,
secret: JWT_SECERT_KEY , // 아무 문자열
fcm_api_key: YOUR_FCM-SERVER-KEY
}