Created the test file for Coursera

[Celaena24]

Description

Created the test file for coursera.py and came up with different test cases to ensure the proper functioning of courses.py in coursera Created init.py file in the coursera folder

Resolves: 887

Checklist

Before submitting this pull request, kindly verify that the ensuing checkpoints have been reached.

• [ ] Have you adhered to the repository's defined coding convention rules?
• [ ] Have you updated the 'documentation.md' file with the method/function documentation?
• [ ] Have you sent a message along with the result or response?
• [ ] Have you used the try-catch technique?
• [ ] Has the method/class been added to the documentation (md file)?

Screenshots

Additional Notes/Comments

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