fix: :bug: Fix generation of objectbox.g.dart

Update README.md

Update README.md

docs: :memo: Add README.md and LICENSE files.

chore: :fire: remove default_model file

chore: :truck: rename env.json file to env.json.example

docs: :memo: Add doc to the SizedBoxExtension

docs: :memo: Add docs to App Entry file

docs: :memo: Add docs to provider_observer file

docs: :memo: Add docs to router files

docs(clients): :memo: Update dependencies and documentation for clients

Update main.dart

add french translations

setup internalization with with easy_l10n

add a way to translate new messages in my app