Add Kiswahili Translation for README (#1339)

[moha230]

This pull request adds a Kiswahili (Swahili) translation of the project's README file to improve accessibility for Kiswahili-speaking developers.

Changes Made

• Added a new README-sw.md file with the Kiswahili translation in the doc folder
• Preserved original meaning, structure, and tone.

Related Issue

Closes #1339

Checklist

• Translation reviewed for clarity and accuracy
• Proper file naming and placement
• Linked translation in the main README