readme added

README

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+# Link Shortener
+
+A simple and fast URL shortener service built with Go and Redis.
+
+## Features
+
+- Shorten long URLs into compact short links
+- Redirect short links to original URLs
+- 30-day expiration for stored links
+
+## Getting Started
+
+### Prerequisites
+
+- Docker and Docker Compose
+
+### Installation & Running
+
+1. Clone the repository:
+```bash
+git clone https://github.com/dusiburg/link-shortener
+cd link-shortener
+```
+
+2. Start the application with docker compose:
+```bash
+docker compose up
+```
+
+The service will be available at `http://localhost:8080`
+
+## API Endpoints
+
+### Create Short Link
+
+**Request:**
+```
+GET /l/{original-url}
+```
+
+**Example:**
+```bash
+curl "http://localhost:8080/l/https://example.com/very/long/url"
+```
+
+**Response:**
+```json
+{
+  "status": "success",
+  "short_link": "http://localhost:8080/r/abc123xyz",
+  "original_link": "https://example.com/very/long/url",
+  "expires_in": "30d"
+}
+```
+
+### Redirect to Original Link
+
+**Request:**
+```
+GET /r/{short-id}
+```
+
+**Example:**
+```bash
+curl "http://localhost:8080/r/abc123xyz"
+```
+
+This will redirect to the original URL.
+
+### Health Check
+
+**Request:**
+```
+GET /ping
+```
+
+**Response:**
+```json
+{
+  "status": "success"
+}
+```
+
+## Configuration
+
+Environment variables can be set via `.env` file or docker compose:
+
+- `SERVER_HOST` - Server host (default: `localhost`)
+- `SERVER_PORT` - Server port (default: `8080`)
+- `REDIS_URL` - Redis connection URL (required)
+
+## Project Structure
+
+```
+.
+├── cmd/
+│   └── main.go              # Application entry point
+├── internal/
+│   ├── config/              # Configuration management
+│   ├── db/                  # Database connections
+│   ├── handlers/            # HTTP request handlers
+│   ├── http/                # HTTP server setup
+│   ├── repositories/        # Data access layer
+│   └── services/            # Business logic
+├── docker-compose.yml       # Docker Compose configuration
+├── Dockerfile               # Multi-stage Docker build
+└── README                   # This file
+```
+
+## Development
+
+To build locally without Docker:
+
+```bash
+go build -o bin/application ./cmd
+./bin/application
+```
+
+Make sure Redis is running before starting the application.