Missing CONTRIBUTING.md file

[archanasingh11]

Description:

The CONTRIBUTING.md file is missing from the Frontend_Mentor repository. This file is essential for guiding new contributors through the process of setting up the project, adhering to coding standards, and submitting pull requests. Without it, contributors may lack clarity on how to effectively contribute to the project, which could lead to inconsistencies and confusion.

I recommend adding a CONTRIBUTING.md file to outline:

• Steps for setting up the repository locally.
• Branching and submission of pull requests.
• Code style guidelines and best practices.
• How to report issues and propose new features.

Please @beRajeevKumar assign me this task with labels "GSSOC-Ext", "hacktoberfest-accepted" and "level2".