I tried to install Zap, but I cannot because when I run yarn it gives me a network connection and stop at the end of the package update.
I have a network connection. I know how to develop with electron, nodejs and in general javascript, but I never used yarn. I don't think that the connection is not working here, I have no problem browsing anywhere and my line is fiber 200 Mbs
yarn install v1.16.0
[1/5] Validating package.json...
[2/5] Resolving packages...
[3/5] Fetching packages...
info There appears to be trouble with your network connection. Retrying...
See
here for the code changes that were necessary to add Litecoin support to Zap. You could use this as a template for your own extensions to support whatever coin(s) you're interested in.