install guide

1. Clone the repository.
2. Create a postgres database for development.
3. cd backend and run npm install.
4. Inside the backend directory, create a .env file with your own database url as DATABASE_URL="postgresql://user:password@localhost:5432/whms"
5. Inside the backend directory run npm run migrate_dev.
6. in the backend directory run npm run generate
7. in the backend directory, run npm run dev.
8. Open a second terminal, cd frontend/mini_inventory, run npm install and then npm run dev.