add new LED key systick sample code

guowenxue

2018-05-16 a22d9c106276bb1819e583012d7ea41b6529b318

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<?xml version="1.0" encoding="iso-8859-1"?> 
 
<workspace> 
  <project> 
    <path>$WS_DIR$\stm32_ov7670.ewp</path> 
  </project> 
  <batchBuild/> 
</workspace>