Add comprehensive README.md documentation

[Copilot]

Repository lacked root-level documentation. Added README.md covering setup, development, and deployment.

Content

• Quick start: Docker Compose setup with MongoDB, backend (NestJS), and frontend (Angular)
• Development: Local setup for both services with pnpm, environment variables, and testing commands
• Architecture: Module structure for coffee logging, users, purchases, and achievements system
• Deployment: Helm chart instructions for Kubernetes with multi-arch Docker images
• API: Swagger documentation reference and main endpoint overview

Key Details

• Documents coffee price and API key configuration via environment variables
• Includes frontend port (46307 for dev, 8080 for production) and backend endpoints
• Notes pnpm 9.15.2+ requirement enforced via packageManager field
• References automated MongoDB backups in Helm deployment

Original prompt

On /, Generate a Readme for this repository

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[Copilot]

Pull Request Overview

This PR adds comprehensive root-level README.md documentation for the Coffee Counter application, covering setup instructions, development workflows, architecture overview, and deployment procedures. The repository previously lacked centralized documentation at the root level.

Key Changes

• Added complete README.md with quick start guide using Docker Compose
• Documented local development setup for both NestJS backend and Angular frontend
• Included Kubernetes deployment instructions with Helm chart reference

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[Copilot]

The documentation states "MongoDB deployment with persistent storage" but the Helm chart templates do not include a MongoDB deployment. The chart only references an existing MongoDB instance via secrets. Consider either:

1. Updating the documentation to clarify that MongoDB should be deployed separately or an existing MongoDB instance should be used
2. Adding a MongoDB deployment to the Helm chart templates

Suggested change

	- MongoDB deployment with persistent storage
	- Integration with an existing MongoDB instance (MongoDB must be deployed separately; connection details are provided via secrets)

[Copilot]

The COFFEE_PRICE environment variable is documented here but is not actually defined in the docker-compose.yaml file. The backend service in docker-compose.yaml only includes MONGO_URI and COFFEE_API_KEY. Either add COFFEE_PRICE to the backend service environment variables in docker-compose.yaml, or remove this line from the documentation since it defaults to 0.4 in the backend code.

Suggested change

- `COFFEE_PRICE`: Price per coffee (default: 0.4)