$ git remote add [<options>] <name> <url>
$ git remote add origin https://github.com/OWNER/REPOSITORY.git
list remote connection
$ git remote -v
...
origin https://github.com/OWNER/REPOSITORY.git (fetch)
origin https://github.com/OWNER/REPOSITORY.git (push)
if error
$ git remote add origin https://github.com/OWNER/REPOSITORY.git
> fatal: remote origin already exists.
To fix this, you can