Ergo peer-to-peer networking library

### Roadmap:
- Features required for SPV node: connection, sending requests;
- Connection to a peer (handshake);
- Peer management;
- Sending peer requests, listening to peer requests;
- Peer discovery;
- Bindings for Wasm/iOS/Android;

## Changelog
See [CHANGELOG.md](CHANGELOG.md).

## Contributing
See [Contributing](../CONTRIBUTING.md) guide.
