Add Download to flash function#1

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vgegok wants to merge 7 commits intoscarabhardware:masterfrom

Commits on Feb 19, 2021

add program to spi flash function
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add program to spi flash function & upload binfile and screenshots
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README show Screenshot
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add xc3sprog executable file
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fix image url
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Commits on May 30, 2022

Add Reboot button
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Update Screenshot/Screenshot.png
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