cli/generate_migration library

1. dartapi package
2. documentation
3. cli/generate_migration.dart

dartapi package

1. Libraries
2. cli/build_project
3. cli/create_project
4. cli/generate_controllers
5. cli/generate_docs
6. cli/generate_migration
7. cli/generate_resource
8. cli/run_migrations
9. cli/run_server
10. constants/create_command_constants
11. dartapi
12. templates/template_engine
13. utils