Update README.md

Author: Avamander

README.md

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 # RF24Signing
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/1080/badge)](https://bestpractices.coreinfrastructure.org/projects/1080)
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 A transparent signing library for RF24Mesh. Requires modified version of RF24Network to function and ATSHA204 library that provides the necessary cryptographic functions.