Adding README to npm module

client-ts/.npmignore

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 *
 !dist/**/*
+!README.md

client-ts/README.md

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+JavaScript and TypeScript clients for SignalR for ASP.NET Core
+
+## Installation
+
+```bash
+npm install @aspnet/signalr-client
+```
+
+## Usage
+
+### Browser
+
+To use the client in a browser, copy `*.js` files from the `dist/browser` folder to your script folder include on your page using the `<script>` tag.
+
+### Node.js
+
+The following polyfills are required to use the client in Node.js applications:
+- `XmlHttpRequest` - always
+- `WebSockets` - to use the WebSockets transport
+- `EventSource` - to use the ServerSentEvents transport
+- `btoa/atob` - to use binary protocols (e.g. MessagePack) over text transports (ServerSentEvents)
+
+### Example
+
+```JavaScript
+let connection = new signalR.HubConnection('/chat');
+
+connection.on('send', data => {
+    console.log(data);
+});
+
+connection.start()
+    .then(() => connection.invoke('send', 'Hello'));
+```