create/starter_language library

1. hoshika_flkit package
2. documentation
3. create/starter_language.dart

hoshika_flkit package

1. Libraries
2. add/feature_writer
3. commands/add_command
4. commands/add_feature_command
5. commands/create_command
6. create/starter_config
7. create/starter_language
8. create/starter_platform
9. create/starter_project_files
10. flkit
11. flkit_cli
12. templates/template_locator
13. utils/cli_process_runner
14. utils/project_files
15. utils/string_case_extensions