Add Spain National ID validator

[carlos3dx]

Feature description

In Spain all citizens has a National ID composed by 8 numbers plus a letter. The letter in fact is calculated with a modulus of the number and a lookup table, avoiding mistyping the ID or people faking it on the fly-

https://en.wikipedia.org/wiki/Documento_Nacional_de_Identidad_(Spain)#Number

Create a function that given a string like "12345678X" (or "12345678-X", some systems put a dash) returns True or False if it is a valid or not.

Would you like to work on this feature?

• Yes, I want to work on this feature!

[carlos3dx]

Please assign me to it, I have the work done, just remains to make the PR