Save Git credentials

https://git-scm.com/docs/git-credential-store https://git-scm.com/book/en/v2/Git-Tools-Credential-Storage https://stackoverflow.com/questions/35942754/how-to-save-username-and-password-in-git-gitextension https://stackoverflow.com/questions/15381198/remove-credentials-from-git#:~:text=You%20could%20also%20disable%20use,%2D%2Dsystem%20%2D%2Dunset%20credential.