参考： https://www.cnblogs.com/delav/p/11118555.html
fatal: remote origin already exists.解决方法
https://blog.csdn.net/u014712086/article/details/107005216/
https://blog.csdn.net/jinxinxin1314/article/details/108318998
多分支工作流程
https://blog.csdn.net/weixin_39393741/article/details/108263691
多人开发git提交流程
https://zhuanlan.zhihu.com/p/140316747
利用git提交代码
https://www.cnblogs.com/jackchensir/p/8306448.html