[POST] 회원가입

회원가입

METHOD	PATH
POST	/user/signup

📌VIEW

📌REQUEST BODY

{
    "email": "soundpicker@email.com",
    "password": "1234",
    "nickname": "사픽"
}

📌RESPONSE BODY

{
    "status": 200,
    "success": true,
    "message": "회원가입성공",
    "data": {
        "email": "soundpicker@email.com",
        "nickname": "사픽"
    }
}