Add note about how to live test
Created by: decentral1se
It was not obvious to me and I only found out about it by fishing around in the issue tracker for a while. This can save time for people who need to make changes over here. Rendered:
https://github.com/decentral1se/doc/blob/74a00e054c664256cf833e27763880c6381e419b/README.md