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Update README.md

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按照 [PN532](https://github.com/elechouse/PN532) 的提示安装库;
Arduino 和 PN532 接好 VCCGNDSDASCL
接上 WS2812B 灯条(可选);
上传 [ReaderTest](tools/ReaderTest.ino) 测试硬件是否工作正常;
上传程序。
打开设备管理器,设置 Arduino 的 COM 号,一些参考如下: