POST
/api/v1/users
요청 값
{ "email": String!, "password": String!, "passwordCheck": String! "nickname": String!, "birth": String! // "1994-06-16" 형식 "sex": String("male" | "female")! } ex) { "email": "kate@gmail.com", "password": "637849dklfjdlfk", "passwordCheck": "637849dklfjdlfk", "nickname": "Kate", "birth": "1994-06-16", "sex": "male" }