Update README.md

README.md

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 # Quick overview
 
 If you are new to the HackRF+PortaPack+Mayhem, there is an awesome introductory video by [Tech Minds](https://www.youtube.com/channel/UC9a8Z6Sp6eb2s3O79pX5Zvg) available for you:
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 [![Setup and overview](https://img.youtube.com/vi/kjFB58Y1TAo/0.jpg)](https://www.youtube.com/watch?v=kjFB58Y1TAo)
 
 # Frequently Asked Questions