//请求  /interface/add
//header Content-Type:application/json

{
   "title": "testapi",
   "desc": "api",
   "method": "post",
   "path": "/testapi",
   "project_id": 8,
   "req_headers": [
      {
         "key": "h",
         "value": "t"
      }
   ],
   "req_params_type": "form",
   "req_params": [
      {
         "name": "uid",
         "value": 100,
         "type": "text"
      },
     {
         "name": "gid",
         "value": 1001,
         "type": "text"
      }
   ],
   "res_body_type": "json",
   "res_body": "{\"tt\": 222}"
}

//返回结果
{
    "errcode": 0,
    "errmsg": "success",
    "data": {
        "__v": 0,
        "_id": 422,
        "title": "testapi",
        "project_id": 8,
        "path": "/testapi",
        "desc": "api",
        "method": "post",
        "req_params_type": "form",
        "res_body": "{\"tt\": 222}",
        "res_body_type": "json",
        "uid": 0,
        "add_time": 1499658569,
        "up_time": 1499658569,
        "req_params_form": [
            {
                "name": "uid",
                "value": "100",
                "_id": "5962f94940a7a5767088fcc0"
            },
            {
                "name": "gid",
                "value": "1001",
                "_id": "5962f94940a7a5767088fcbf"
            }
        ],
        "req_headers": [
            {
                "value": "t",
                "_id": "5962f94940a7a5767088fcc1"
            }
        ]
    }
}