CLI - Command line Interface with clap

1. Clap - Command Line Argument Parser
2. Clap Single positional argument
3. Clap Several positional arguments
4. Clap Single long argument
5. Clap Short arguments
6. Clap accepting string, number, bool - default values
7. Clap add help to each argument
8. Clap show the version number from Cargo.toml
9. Clap Show the description of the crates using the about command
10. Clap Show the description written in the code
11. Clap show generated description
12. Clap validate number range
13. Clap subcommands
14. Clap mutually exclusive
15. Clap mutually exclusive with group
16. Clap example for CLI
17. Clap: improving the help with value_name
18. Clap: one of a fixed list of values (enumerated)
19. Clap and environment variables
20. Clap - set default value if other flag provided
21. Clap - set default value if other argument provided
22. Clap - set default value based on another flag
23. Clap complete enum - name of shell
24. Repeat the same argument several times
25. Limit the number of values for a vector argument
26. Clap: fixed list of valid values for generic type
27. Clap: arbitraty function to validate argument )
28. Clap: default value only if the flag was provides