Spanish translation add

[41646F6C666F]

As asked by the issue #17 to add languages.
Here's come the Spanish translation strings; non-breaking change PR.

Update needed in #17 (comment).

EDIT:
As this repo is active in the Hacktoberfest 2022,
please add the tag hacktoberfest-accepted to this issue if you accept and merge it.

[TechWiz-3]

You speak French and Spanish fluently? 😮

[41646F6C666F]

Yes @TechWiz-3, and I have degrees in both languages 😉

[TechWiz-3]

Thank you sir

[41646F6C666F]

You are welcome @TechWiz-3.

But don't forget to add the label hacktoberfest-accepted to this Pull Request, and the others valid ones.
Without that, yourself and the contributors won't be getting any point for the Hacktoberfest 😉

[TechWiz-3]

Maintainers get points for hacktoberfest?

[41646F6C666F]

Yes, like If you add the label hacktoberfest-accepted to the issues as I told you.

All the best 😉