docs(examples): add multiple consumers usage

[0xvbetsun]

It was not clear how to use multiple consumers. So, that is why this example has been added

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[darkgl0w]

Thank you for contribution :)
It is always good to have an example that illustrates how to use a package ^^

LGTM