added readme file

Author: rahamka

README.md

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+# RestCountriesAPI
+
+A web application that allows users to explore detailed information about over 250 countries. Each country is displayed in an interactive card with key data points.
+
+## Live Demo
+View Project: https://rahamka.github.io/RestCountriesAPI/index.html
+
+## Features
+- Displays data for over 250 countries  
+- Interactive and responsive country cards  
+- Shimmer/skeleton effect for loading states  
+- Built with modern CSS and JavaScript  
+
+## What I Learned
+- Centering elements using `margin-inline: 0 auto;`  
+- Implementing shimmer/skeleton loading effects  
+- Using CSS variables for cleaner styling  
+- Fetching and displaying API data dynamically  
+
+## Installation
+1. Clone the repository:  
+   ```bash
+   git clone https://github.com/rahamka/RestCountriesAPI.git