Add Support for DataCamp Courses

[Purus]

• [x ] I've verified and I assure that I'm running youtube-dl 2018.01.21
• [x ] At least skimmed through the README, most notably the FAQ and BUGS sections
• [x ] Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• [x ] Site support request (request for adding support for a new site)

If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single Course: https://www.datacamp.com/courses/intro-to-python-for-data-science
• Tracks: https://www.datacamp.com/tracks/data-analyst-with-python

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Description of your issue, suggested solution and other information

Please add support for downloading courses from DataCamp.

[luizconrado]

Hi @dstftw
Could you still add DataCamp to youtube-dl?
If it is still possible, I can provide you an account.
Thank you.

[marcvisconte]

If this is still an option, DataCamp has FREE COURSES for the week of 5/17/2020 -
You can log in with a Gmail or FB account, and have access to a ton of courses. This will give you the account access that it needed.