Update README for SQLite-first setup

README.md

@@ -1,5 +1,85 @@
 # CanteenHub - Multi-User Collaborative Canteen & Food Ordering System
 
+A zero‑framework PHP application that uses **SQLite** as its default database. It replaces informal chat‑based lunch ordering threads with a structured web interface.
+
+---
+
+## Key Features
+
+1. **User Authentication** – Login `/login` & Register `/register` with password hashing. Pre‑seeded demo accounts (password: `password`).
+2. **Session Creation** – Any user can start a food session, paste menu items, and invite colleagues.
+3. **Self‑Ordering** – Browse active sessions, select multiple items, set quantities and notes.
+4. **Bill Calculation** – Host enters final prices, app computes each participant’s bill and generates copy‑ready markdown.
+
+---
+
+## How to Run (SQLite)
+
+### Option 1: PHP Built‑in Server
+```bash
+php -S localhost:8000 -t public
+```
+Visit `http://localhost:8000`.
+
+### Option 2: Docker Compose
+```bash
+docker compose up -d --build
+```
+Visit `http://localhost:8080`.
+
+### Option 3: Apache
+Point the VirtualHost `DocumentRoot` to the `public/` directory (rewrites handled by `public/.htaccess`).
+
+---
+
+## Database Setup (SQLite)
+
+1. Copy the example env file and set SQLite configuration:
+```bash
+cp .env.example .env
+```
+Edit `.env`:
+```
+DB_CONNECTION=sqlite
+DB_DATABASE=storage/database.sqlite
+```
+2. Create the SQLite file and run the schema initialization (executed automatically on first request):
+```bash
+mkdir -p storage
+touch storage/database.sqlite
+php -r "require 'public/index.php'; App\\Core\\Database\\Database::initSchema();"
+```
+The `initSchema()` method creates all tables and seeds initial data if the database is empty.
+
+### Resetting Data
+To start from a clean slate:
+```bash
+rm storage/database.sqlite
+mkdir -p storage
+touch storage/database.sqlite
+php -r "require 'public/index.php'; App\\Core\\Database\\Database::initSchema();"
+```
+Or invoke the built‑in reset:
+```bash
+php -r "require 'public/index.php'; App\\Core\\Database\\Database::initSchema();"
+```
+(Calling `initSchema()` drops existing tables and recreates them.)
+
+---
+
+## Troubleshooting
+
+- **Missing PDO SQLite extension** – Install via `sudo apt-get install php8.2-sqlite3`.
+- **File permission issues** – Ensure the web server user can read/write `storage/`.
+- **Database connection errors** – Verify `.env` settings and that `storage/database.sqlite` exists.
+
+---
+
+## License
+
+MIT License. See `LICENSE` for details.
+
+
 A zero-framework PHP application built to replace informal Mattermost/chat lunch ordering threads. Anyone on the team can log in, start a food session, join any colleague's session, and place their own orders with automatic bill calculation upon food arrival.
 
 ---