Gem domestic resource package

Using package management can significantly reduce the cost of referencing and managing third-party libraries, but many sources are overseas, which often leads to timeouts during installation. We can solve this by switching to domestic sources or using a proxy.

This document is a compilation of domestic gem resources for bejson, including Tsinghua University's gem packages and Ruby China's gem packages.

gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/

gem sources --add https://mirrors.tuna.tsinghua.edu.cn/rubygems/ --remove https://rubygems.org/