How to use sample visuals from power bi github repository

I'm tyring to use Power Bi gitub code and I can't get it to work. All I want is too see this graph working:

https://github.com/jianingyan/PowerBI-visuals/blob/master/src/Clients/Visuals/visuals/graph.ts

But when I clone this repository there is no pbiviz file to start:

https://github.com/Microsoft/PowerBI-visuals

I have followed all instructions on setting up the environment, adding the certificate and creating a new Power BI Visual Project just to test that everything is correct and got the sample "count" graph running. Is there a way I can use the code of that graph on the new visual project I just created?

Thanks in advance