Add initial MySQL schema, gitignore, and improved README

- db.sql: tables for printers, filaments, print_jobs, todos, pricing_config
- .gitignore: excludes .env files and Python build artefacts
- README: cleaned up structure and added Getting Started section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -0,0 +1,40 @@
+# POPS — Printing Operations Production System
+
+A web-based production management system for 3D print farms.
+
+## Features
+
+- **Printer overview** — see all printers and their current status at a glance
+- **Job queue** — track what is printing now and what is in the pipeline
+- **Status updates & to-do lists** — stay on top of ongoing work
+- **Filament database** — connect to and manage your filament inventory
+- **Price calculator** — calculate job costs
+- **Print log** — keep a history of completed print jobs
+
+## Stack
+
+- **Backend:** FastAPI
+- **Frontend:** Web UI (served by FastAPI)
+- **Database:** MySQL (managed via Alembic migrations)
+- **Deployment:** Docker
+
+## Getting Started
+
+### Prerequisites
+
+- Docker & Docker Compose
+- A MySQL database instance
+
+### Run
+
+```bash
+docker compose up
+```
+
+The application will be available at [http://localhost:8720](http://localhost:8720).
+
+### Database Migrations
+
+```bash
+alembic upgrade head
+```