how we can add coin?
I searched and couldn't find anything so I'm going to assume they are not doing it. They are focusing on delivering a working project first.
That is correct. Right now we're simply focused on development and innovation. Once we're closer to our Q4 mainnet release we'll be sure to release standard guidelines for token/coin listings but we'll be working to list Bitcoin, Litecoin, NEO, ETC, and other larger blockchains first before adding small-cap tokens.