Add README.md

README.md

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+# go-blindsecp256k1
+Blind signature over [secp256k1](https://en.bitcoin.it/wiki/Secp256k1), based on *"[An Efficient Blind Signature Scheme Based on the Elliptic CurveDiscrete Logarithm Problem](http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf)"* paper.
+
+**WARNING**: this repo is experimental, do not use in production.
+
+## Usage
+
+```go
+// message to be signed
+msg := new(big.Int).SetBytes([]byte("test"))
+
+// create new signer
+signerPrivateData := blindsecp256k1.NewSigner()
+signerPublicData := signerPrivateData.PublicData()
+
+// user blinds the msg
+msgBlinded, user := blindsecp256k1.Blind(msg, signerPublicData)
+
+// signer signs the blinded message
+sBlind := signerPrivateData.BlindSign(msgBlinded)
+
+// user unblinds the blinded signature
+sig := blindsecp256k1.Unblind(sBlind, msg, user)
+
+// signature can be verified with signer PublicKey
+verified := blindsecp256k1.Verify(msg, sig, signerPublicData.Q)
+assert.True(t, verified)
+```

blindsecp256k1.go

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 // Package blindsecp256k1 implements the Blind signature scheme explained at
 // http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf
+//
+// LICENSE can be found at https://github.com/arnaucube/go-blindsecp256k1/blob/master/LICENSE
 package blindsecp256k1
 
 // WARNING: WIP code