Fix Formatting and Content Issues in CONTRIBUTING.md

[richardar]

resolves #63

Description

This pull request addresses various formatting and content issues in the CONTRIBUTING.md file. Changes include fixing formatting inconsistencies, converting content to markdown syntax for better rendering on GitHub, adjusting heading levels for improved hierarchy, ensuring proper formatting and highlighting of code blocks, and enhancing grammar and language for clarity. These modifications aim to enhance readability and usability, providing contributors with a clearer guide on how to contribute to the ExamTime project.

Resolves: #63

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

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[github-actions]

Great job, @gratusrichard! 🎉 Thank you for submitting your pull request. Your contribution is valuable and we appreciate your efforts to improve our project.

We will promptly review your changes and offer feedback. Keep up the excellent work! Kindly remember to check our contributing guidelines

[richardar]

@hereisSwapnil I have made the mentioned changes, kindly check it out.