fix readme.md

See merge request !2

Changed the car card rendering process from directly appending to innerHTML to using a string variable for concatenation. This change provides performance benefits by limiting direct DOM manipulation. Additionally, a new "category" field has been added to the car card.

Optimize car card rendering process on index.js

See merge request !1

Changed the car card rendering process from directly appending to innerHTML to using a string variable for concatenation. This change provides performance benefits by limiting direct DOM manipulation. Additionally, a new "category" field has been added to the car card.