DNS Provider Dynadot | Add description of "External program"

[andi-at-1]

Is your feature request related to a problem? Please describe.
Dynadot isn´t supportet as DNS provider, and i don´t find a description of how to use the "External program" provider to implement it as a sh script.

thanks!

Describe the solution you'd like
Document the external program
Add dynadot if possible

Describe alternatives you've considered

Additional context
https://www.dynadot.com/de/domain/api

[0xJacky]

Our project uses Lego as the certificate issuance tool. You may consider visiting https://github.com/go-acme/lego and donating to the project's author to expedite the adaptation work for Hostinger.