Added 'Using Python for research' course from Harvard. (#4650)

* Update free-courses-en.md

This is a course from Harvard University's CS50 about Web Programming with Python and JavaScript.
You can know it is free  by looking at the 'CS50 Certificate' section you can read that you only need to pay for the certificate but the course is Free.

* Update free-courses-en.md

Resubmitted the PR by changing the title as given by the resource.

* Update free-courses-en.md

Resubmit PR with the title as given by the resource: CS50’s Web Programming with Python and JavaScript.
Added in Alphabetical List.
Sorry,but it is my first PR so struggling a little bit.

* Update free-courses-en.md

Added Using Python for Research course from edX Harvard.
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@ -501,6 +501,7 @@
* [Python Tutorial](https://www.w3schools.com/python/) - W3Schools
* [SoloLearn](https://www.sololearn.com/Course/Python/)
* [The Python Tutorial](https://docs.python.org/3/tutorial/)
* [Using Python for Research](https://www.edx.org/course/using-python-for-research) (edX Harvard)
#### Django