readme: add readme

Signed-off-by: Ignacio Hagopian <jsign.uy@gmail.com>

README.md

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+# Pure Go Filecoin signer
+
+
+> A pure Go (CGO free) signing library for Filecoin
+
+Supports both Secp256k1 and BLS signatures.
+
+An important goal of this library is avoiding CGO dependencies which is very convenient
+for simplicity and painless compatibility in multiples OS and CPU architectures.
+
+## Roadmap
+
+- [ ] Provide a Wallet interface that can be a drop-in replacement with Lotus wallets.
+- [ ] Include more test vectors for both secp256k1 and BLS signatures.
+
+Use this space to show useful examples of how a project can be used. Additional screenshots, code examples and demos work well in this space. You may also link to more resources.
+
+## Contributing
+
+Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are **greatly appreciated**.
+
+
+## License
+
+Distributed under the MIT License. See `LICENSE` for more information.
+
+## Contact
+
+Ignacio Hagopian - [@ignaciohagopian](https://github.com/jsign) 
+
+
+## Acknowledgements
+* [@dignifiedquire](https://github.com/dignifiedquire)
+* [@nikkolasg](https://github.com/nikkolasg)
+* [@ribasushi](https://github.com/ribasushi)
+* [@whyrusleeping](https://github.com/whyrusleeping)
+