Add Spanish Translation of Handbook

[2168-btc]

Hi

I would like to contribute to the project by adding a spanish translation of the ordinal handbook. Files have been created using mdbook criteria as requested here (#2128).

Please let us know if you require any edits or updates to the translation files.

thanks

[OrdinalMaxiBiz]

thank you!

[raphjaph]

This is a great start but unfortunately this is not in the correct format for #2385. You can view how the docs look with mdbook serve docs --open. It should have a language switch button on the top right like seen here: https://google.github.io/comprehensive-rust/index.html

[raphjaph]

I just merged #2403, so have a look at the updated README for instructions.