Added README

README.md

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 # Flight Reservation System Backend Application
 
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 This project is a RESTful API built using Java Spring Boot framework, aimed at managing flight reservations. It provides both user-facing functionalities, such as booking flights, and administrative functionalities, such as managing flights and users.
 
 ## Project Overview
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 The system allows users to search for flights based on departure and arrival points, view details, and make reservations. Admin users have additional privileges, including flight and user management.
 
 ### Flight and Booking Overview:
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 These are the core components around which the system revolves.
 
 ## Technologies Used
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 - **Java 8+:** Programming language
 - **Spring Boot:** Framework for creating RESTful APIs
 - **Spring Data JPA:** Data access framework
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 - **GitHub Actions:** CI/CD pipeline
 
 ## Database Schema
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 ### User Table
 
 | Field       | Type                | Description       |
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 ## CI/CD with GitHub Actions
 
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 This project uses GitHub Actions for continuous integration and delivery. The workflow can be found in the `.github/workflows/app.yml` file.
 
 ### Pipeline Overview
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 ## Project Setup
 
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 ### Running with Docker
 
 1. Install Docker and Docker Compose on your machine.
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 ## API Endpoints
 
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 ### User Operations
 
 - `POST /api/users/register`: Register a new user.
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 # Sample API Requests
 
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 ## Flight Search