Axum with SeaORM example app

1. Modify the DATABASE_URL var in .env to point to your chosen database

2. Turn on the appropriate database feature for your chosen db in api/Cargo.toml (the "sqlx-postgres", line)

3. Execute cargo run to start the server

4. Visit localhost:8000 in browser

Run tests:

cd api
cargo test

Run migration:

cargo run -p migration -- up

Regenerate entity:

sea-orm-cli generate entity --output-dir ./entity/src --lib --entity-format dense --with-serde both