added Countries API

New_APIs/Countries_API/README.md

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+# Countries & Cities API
+
+## Description
+This API provides detailed information about countries and their cities. You can retrieve data such as capital, language, currency, latitude, longitude, continent, and neighboring countries. Additionally, you can filter countries by language or currency, find neighboring countries of a specific country, and list all countries in a specific continent.
+
+## Features
+1. Retrieve information about countries, including language, currency, latitude, longitude, continent, and neighboring countries.
+2. Filter countries by language or currency.
+3. Find neighboring countries of a specific country.
+4. List all countries in a specific continent.
+
+## Requirements
+- Node.js
+- MongoDB
+- Postman
+
+## Installation
+1. Clone the Repository:
+
+```bash
+git clone <repository-url>
+cd <repository-directory>
+```
+
+2.Install Dependencies:
+
+```bash
+npm install
+```
+
+3. Setup MongoDB:
+ - Ensure MongoDB is installed and running on your local machine or a remote server.
+ - Create a new database and collection for storing country data.
+
+4. Start the Server:
+
+```bash
+node server.js
+```
+
+## API Endpoints:
+
+1. Get All Countries:
+
+```http
+GET /api/countries
+```
+
+2. Get Country by Name:
+
+```http
+GET /api/countries/:name
+```
+
+3. Get Countries by Language:
+
+```http
+GET /api/countries/language/:language
+```
+
+4. Get Countries by Currency:
+
+```http
+GET /api/countries/currency/:currency
+```
+
+5. Get Neighboring Countries:
+
+```http
+GET /api/countries/:name/neighbors
+```
+
+6. Get Countries by Continent:
+
+```http
+GET /api/countries/continent/:continent
+```
+
+## Notes
+- Ensure server is running at 5000.
+- Use Postman or similar tools to test and interact with the API endpoints.