docs: nodejs example (#98)

* docs: nodejs example

* prettier fix

Co-authored-by: Michael Cohen <[email protected]>

Author: Meemaw

README.md

@@ -20,6 +20,7 @@ This is a best effort delivery messaging system. Messages that are not received
 We recommend switching to Node.js version 16 to make sure common crypto dependencies work. Our minimum supported version is 16.11.0.
 
 - Install this package with `npm install @opensea/stream-js`
+- **NodeJS only:** Install the WebSocket library with `npm install ws`
 - Install the required dev-dependency to use the Phoenix client for web socket connections `npm install --save-dev @types/phoenix`
 
 # Getting Started
@@ -30,6 +31,8 @@ In order to make onboarding easy, we've integrated the OpenSea Stream API with o
 
 ## Create a client
 
+### Browser
+
 ```javascript
 import { OpenSeaStreamClient } from '@opensea/stream-js';
 
@@ -38,6 +41,20 @@ const client = new OpenSeaStreamClient({
 });
 ```
 
+### Node.JS
+
+```javascript
+import { OpenSeaStreamClient } from '@opensea/stream-js';
+import { WebSocket } from 'ws';
+
+const client = new OpenSeaStreamClient({
+  token: 'openseaApiKey'
+  connectOptions: {
+    transport: WebSocket
+  }
+});
+```
+
 You can also optionally pass in:
 
 - a `network` if you would like to access testnet networks.