Study market shares of cryptocurrencies

Until now we have been skeptical about supporting different
cryptocurrencies base on cost-effectiveness: is it worth the trouble?
Especially given the complex and quickly evolving cryptocurrency landscape.

But in the 2016 crowdfunding, Bitcoin was a big source of income so it
could be worth evaluating the market shares of other cryptocurrencies
apart from Bitcoin to consider adding one or two new options.

Parent Task: #7314 (closed)

Original created by @sajolida on 12074 (Redmine)