add ladder to prog 1

QuakeGod

2023-09-05 df03213660361b1c771f0a3f21b6ddaeaef7763a

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<?xml version="1.0" encoding="utf-8"?> 
<Animals> 
  <dog>hei bei</dog> 
  <pig>pei qi</pig> 
  <Cat>hua mao</Cat> 
  <Cat name="jiafei" color="yellow">jia fei mao</Cat> 
  <Cat name="jingzhang" color="black">hei mao jing zhang</Cat> 
</Animals>