Add workflow for syncing course content and utility script for downloading course content

[iqbalcodes6602]

Fixes: #10

• Added the sync-course.yml file to run the github action.
• This github action runs only when some changes ar emade to sync courses branch.
• We planned to execute this process by keeping a log of the sync request in the sync-courses.json file.
• To raise a sync request you need to add some details in the sync-courses.json file and raise pull request with the changes to sync-course branch.
• The github action runs the utils/download_and_sync_courses.py script to download the course content
• The downloaded course content gets comitted by the github bot in the same branch.
• When the pull request is merged to the main branch we would get the latest course content in the main branch.

[pabo99]

Just a few comments, and then we approve and merge.

[pabo99]

Thank you so much, @iqbalcodes6602 !