ethereum & ETC
https://github.com/ethereum/go-ethereum
https://discountry.github.io/tutorial/2018/01/11/ico-in-nine-steps/
https://onepagelove.com/templates/free-templates
git
https://github.com/FreeCodeCampChina/challenges/blob/translate/CONTRIBUTING.md#常见问题
$ git add .
# git add --all
$ git add -A
$ git status
$ git pull --rebase
$ git add .
$ git rebase --continue