Added some spark tutorials (#6560)
* Update free-courses-en.md
* space
* space
* add attribution, index link
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Co-authored-by: NEric Hellman <eric@hellman.net>
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* Update free-courses-en.md
* space
* space
* add attribution, index link
* space
Co-authored-by: NEric Hellman <eric@hellman.net>