Translate English alt text to Tunisian in README

[Roshanjossey]

🎯 Goal Translate English alt text to Tunisian in the README translation to improve accessibility for Tunisian speakers.

🐞 Problem The Tunisian translation has images with English alt text, which makes the content less accessible to Tunisian speakers using screen readers and other assistive technologies.

💡 What needs to be done Translate all English alt text to Tunisian in the tutorial images. You can find the file at: https://github.com/firstcontributions/first-contributions/blob/main/docs/translations/README.tn.md

Common English alt text that needs translation:

• "fork this repository" → translate to Tunisian
• "clone this repository" → translate to Tunisian
• "copy URL to clipboard" → translate to Tunisian
• "git status" → translate to Tunisian
• "create a pull request" → translate to Tunisian
• "submit pull request" → translate to Tunisian

Example of what needs to be fixed:

<!-- Current (English alt text) -->
<img align="right" width="300" src="https://firstcontributions.github.io/assets/Readme/fork.png" alt="fork this repository" />

<!-- Should be (translated to Tunisian) -->
<img align="right" width="300" src="https://firstcontributions.github.io/assets/Readme/fork.png" alt="[Tamil (Sri Lanka) translation of 'fork this repository']" />

[!IMPORTANT] Please only address one issue in a PR. Let's make it possible for more people to solve issues here.

📋 Steps to solve the problem

• Comment below about what you've started working on.
• Find all images with English alt text in the Tunisian README
• Translate the alt text to Tunisian while keeping the meaning clear
• Ensure alt text is descriptive and meaningful in Tamil (Sri Lanka)
• Add, commit, push your changes.
• Submit a pull request and add this in comments - 'Addresses #'
• Ask for reviews in comments section of pull request.
• Celebrate your contribution to this project. 🎉

[Indian24]

Would like to work on this issue.