commands/add_command library

1. dpk package
2. documentation
3. commands/add_command.dart

dpk package

1. Libraries
2. commands/add_command
3. commands/downgrade_command
4. commands/get_command
5. commands/parent_commands/patch_command
6. commands/remove_command
7. commands/run_command
8. commands/subcommands/patch/apply_command
9. commands/subcommands/patch/generate_command
10. commands/subcommands/patch/init_command
11. commands/upgrade_command
12. config/config
13. config/data/catalog
14. config/data/config_data
15. config/data/dependency
16. config/data/dpk_config
17. config/data/dpk_workspace_environment
18. config/data/scripts
19. constants/pubspec.g
20. core/command_runner
21. core/constants
22. core/injection_container
23. core/mixins/config_mixin
24. core/mixins/process_handler_mixin
25. core/mixins/pub_env_mixin
26. core/shell
27. core/types
28. utils/cache_directory
29. utils/collection
30. utils/command_checker
31. utils/extensions/debug_extensions
32. utils/extensions/string_extensions
33. utils/globals/global_args
34. utils/globals/global_patch_args
35. utils/globals/global_pub_args
36. utils/terminal_title