### 發現話題
~~~[api]
post:http://api.satin.com/api/v1/categoryFollow
*user_id=c64148def264f925f000b4943da1ce1f,#用戶id 選填
*pid=2,#分類id
<<<
scucess
{
"code": 200,
"msg": "關注分類成功",
"data": []
}
<<<
error
{
"code": 400,
"msg": "關注失敗",
"data": []
}
