How to find softphoneMediaInfo to pass in demo index.html input?

I cloned this repo and run `npm install`, `grunt` and `grunt demo` command and I'm able to open it on `https://localhost:9943/` url. I'm just beginner with AWS connect so I'm not able to figure out what value I've to pass in [input field](https://github.com/aws/connect-rtc-js/blob/master/demo/index.html#L19) as a softphoneMediaInfo and from where I can get these details?

Any help would be valuable. thanks.

Start with the input field in demo/index.html and reproduce the npm install, grunt, and grunt demo steps described in the issue. Document what softphoneMediaInfo represents, where an AWS Connect user obtains it, and provide a usable example so the demo setup is complete.

Written by the indexing model from the issue text.