Added readme file doc for CountryAPI

Existing_API_Collection/CountryAPI/README.md

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+## Table of Contents
+
+- [About](#about)
+- [How to use](#how-to-use)
+- [Build with](#build-with)
+- [Author](#author)
+- [Contributors](#contributors)
+
+## About
+
+[Country API](https://github.com/developer-student-clubs/APIVerse/tree/master/Existing_API_Collection/CountryAPI) is a REST API that provides information about countries including name, flag, capital, continent, population, currency, languages, etc.
+
+## How to use
+
+- Clone the repository from [APIVerse](https://github.com/developer-student-clubs/APIVerse)
+- Open the folder Existing_API_Collection > CountryAPI
+- Copy the path of index.html file
+- Paste the path in your browser
+- You will see the following page
+- <img src="screenshots/home.png" alt="Home Page" width="500px">
+- Type the name of the country in the search box and click on search
+- You will see the following page
+- <img src="screenshots/search.png" alt="Search Page" width="500px">
+- Click on the name of the country to see the details
+
+## Build with
+
+- HTML
+- CSS
+- JavaScript
+- [Rest-Countries API](https://restcountries.com/v3.1/)
+
+## Author
+
+- Mahek-Garala [GitHub](https://github.com/Mahek-Garala)
+- Mahek Garala [LinkedIn](https://www.linkedin.com/in/mahek-garala-179911261/)
+
+## Contributors
+
+![Contributors](https://contrib.rocks/image?repo=developer-student-clubs/APIVerse)