Update README.md

Author: kungfupizza

README.md

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 # Signer
+Signer is for the crypto world. This library help Arduino lovers to sign their data, generate keys and sign a transaction for Ethereum network.
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+To install this library, download this repo as zip and extract in C:/Documents/Arduino/libraries
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+The SignerTest.ino examples is to see Signing of text and generation of Private and Public key
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+The Transaction Signer example is used to Sign a transaction for the etheruem network.