Address PR comments

Author: hsubox76

packages/util/README.md

@@ -4,3 +4,22 @@ _NOTE: This is specifically tailored for Firebase JS SDK usage, if you are not a
 member of the Firebase team, please avoid using this package_
 
 This is a wrapper of some Webchannel Features for the Firebase JS SDK.
+
+## Usage
+
+**ES Modules**
+
+```javascript
+import { Deferred } from '@firebase/util';
+
+// Do stuff with Deferred or any of the other Utils you import
+```
+
+**CommonJS Modules**
+
+```javascript
+const utils = require('@firebase/util');
+
+// Do stuff with any of the re-exported `utils`
+```
+