应用: 淘宝
任务: 打开淘宝，从淘宝首页进入天猫超市，找到‘蒙牛纯牛奶’，加入购物车
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: TYPE
type_text: 蒙牛纯牛奶
step_id: 4
action: CLICK
step_id: 5
action: CLICK
step_id: 6
action: CLICK
step_id: 7
action: STOP