Updated README with script tag embed instructions (livekit#774)

Author: davidzhao

README.md

@@ -30,6 +30,18 @@ yarn add livekit-client
 npm install livekit-client --save
 ```
 
+### Minified JS
+
+To use the SDK without a package manager, you can include it with a script tag:
+
+```html
+<script src="https://cdn.jsdelivr.net/npm/livekit-client/dist/livekit-client.umd.min.js"></script>
+```
+
+The module will be exported under `LivekitClient` in the global namespace. When
+accessing symbols from the class, you'd need to prefix them with `LivekitClient.`.
+For example, `Room` becomes `LivekitClient.Room`.
+
 ## Usage
 
 Examples below are in TypeScript, if using JS/CommonJS imports replace import with:
@@ -297,7 +309,9 @@ If you are targeting legacy browsers, but still want adaptiveStream functionalit
 Also when targeting legacy browsers, older than the ones specified in our browserslist target, make sure to transpile the library code to your desired target and include required polyfills with babel and/or corejs.
 
 <!--BEGIN_REPO_NAV-->
+
 <br/><table>
+
 <thead><tr><th colspan="2">LiveKit Ecosystem</th></tr></thead>
 <tbody>
 <tr><td>Client SDKs</td><td><a href="https://github.com/livekit/components-js">Components</a> · <b>JavaScript</b> · <a href="https://github.com/livekit/client-sdk-rust">Rust</a> · <a href="https://github.com/livekit/client-sdk-swift">iOS/macOS</a> · <a href="https://github.com/livekit/client-sdk-android">Android</a> · <a href="https://github.com/livekit/client-sdk-flutter">Flutter</a> · <a href="https://github.com/livekit/client-sdk-unity-web">Unity (web)</a> · <a href="https://github.com/livekit/client-sdk-python">Python</a> · <a href="https://github.com/livekit/client-sdk-react-native">React Native (beta)</a></td></tr><tr></tr>