Update firmware

firmware/hardware_test/t-beam-v1.x/README.MD

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+### Describe
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+* [Comprehensive](./Comprehensive/) directory test firmware includes TX,RX,GPS, POWER, WiFi , Use IO38 to switch function pages
+* [Radio](./Radio/) directory separate test RF
+
+### To write firmware, please check the corresponding link below
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+- [Flash firmware in Mac OS](https://github.com/Xinyuan-LilyGO/LilyGo-Document/blob/master/MacFlashBin.md)
+- [Flash firmware in windows](https://github.com/Xinyuan-LilyGO/LilyGo-Document/blob/master/WinFlashBin.md)
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