Update readme

README.md

@@ -3,6 +3,10 @@
 [![](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](https://libp2p.io/)
 ![](https://img.shields.io/github/issues-raw/nodefactoryio/js-libp2p-noise)
 ![](https://img.shields.io/github/license/nodefactoryio/js-libp2p-noise)
+[![Build Status](https://travis-ci.com/NodeFactoryIo/js-libp2p-noise.svg?branch=master)](https://travis-ci.com/NodeFactoryIo/js-libp2p-noise)
+![](https://img.shields.io/badge/yarn-%3E%3D1.17.0-orange.svg?style=flat-square)
+![](https://img.shields.io/badge/Node.js-%3E%3D12.4.0-orange.svg?style=flat-square)
+[![Discourse posts](https://img.shields.io/discourse/https/discuss.libp2p.io/posts.svg)](https://discuss.libp2p.io)
 
 > Noise libp2p handshake for js-libp2p
 
@@ -10,7 +14,25 @@ This repository contains TypeScript implementation of noise protocol, an encrypt
 
 ## Usage
 
-TBD (package not yet published)
+When published, package should be imported as: `import { Noise } from 'libp2p-noise'`.
+
+Example of instantiating noise and passing it to the libp2p config:
+```
+const NOISE = new Noise(privateKey);
+
+const libp2p = new Libp2p({
+   modules: {
+     connEncryption: [NOISE],
+   },
+});
+```
+
+Where parameters for Noise constructor are:
+ - *private key* - required parameter (32 bytes libp2p peer private key)
+ - *static Noise key* - (optional) existing private Noise static key
+ - *early data* - (optional) an early data payload to be sent in handshake messages
+ 
+
 
 ## API