GitConfigFileSample

[core]
        repositoryformatversion = 0
        filemode = true
        bare = false
        logallrefupdates = true
        ignorecase = true
        precomposeunicode = true
        sshCommand = ssh -i ~/.ssh/id_rsa_jatapiarogithub
[user]
        email = test@gmail.com
        name = test
[remote "origin"]
        url = git@github.com:test/test.git
        fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
        remote = origin
        merge = refs/heads/master

Refer to: https://medium.com/@pinglinh/how-to-have-2-github-accounts-on-one-machine-windows-69b5b4c5b14e