added a git course (#6298)
* added a git course * added a git course * add Beginner * Update free-courses-en.md * Update free-courses-en.md * Update free-courses-en.md * Update courses/free-courses-en.md whitepace Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com> Co-authored-by: NEric Hellman <eric@hellman.net> Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
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