feat(categories): create model, entity, migrations and seeds

Dockerfile

README.md

src/app/Config/Autoload.php

src/app/Controllers/Migrate.php

.../Database/Migrations/2020-05-29-152000_add_categories.php

src/app/Database/Seeds/CategorySeeder.php

src/app/Entities/.gitkeep

src/app/Entities/CategoryEntity.php

src/app/Models/CategoryModel.php