Build out the -h/--help to include some information about origin and version

[iconoclasthero]

I just spent ca. 5 minutes trying to figure out where this 'totp' command on my machine came from...

I started with:

$ totp --help
usage: totp [-h] {add,-a,show} ...

Print a TOTP token getting the shared key from pass(1).

positional arguments:
  {add,-a,show}
    add (-a)     add a new TOTP entry to the database
    show         (default action) show the current TOTP token for a registered entry

options:
  -h, --help     show this help message and exit

Please include either a --version/-v flag to print the version info OR include it in --help (the latter is more than sufficient).
Please include some sort of origin information in the --help (or, if created and more appropriate, in the --version info) so that one knows the name of the "package" is totp-cli and that it can be found at https://github.com/WhyNotHugo/totp-cli

e.g.,

$ totp --help
totp-cli v. 1.3.0 is a python utility for providing one-time passwords.
See https://github.com/WhyNotHugo/totp-cli for more information.

usage: totp [-h] {add,-a,show} ...

Print a TOTP token getting the shared key from pass(1).

positional arguments:
  {add,-a,show}
    add (-a)     add a new TOTP entry to the database
    show         (default action) show the current TOTP token for a registered entry

options:
  -h, --help     show this help message and exit

or

$ totp --version
totp-cli v. 1.3.0 is a python utility for providing one-time passwords.
See https://github.com/WhyNotHugo/totp-cli for more information.