Feature/translation EN > ES jwt.es.md file

[TheHandyOwl]

NEW: translation EN (current jwt.md file) to ES (new jwt.es.md file)

[TheHandyOwl]

@0xTim , @gwynne , should this HMAC options be 256, 384 and 512?
I can create another pull request to change this option for all languages.

### HMAC

HMAC (Hash-based Message Authentication Code) is a symmetric algorithm that uses a secret key to sign and verify the JWT. Vapor supports the following HMAC algorithms:

- `HS256`: HMAC with SHA-256
- `HS384`: HMAC with SHA-384
- `HS384`: HMAC with SHA-384 // Should be `HS512`: HMAC with SHA-512?

[alemohamad]

Good catch @TheHandyOwl ! In my opinion, we should add the fix in other languages in this PR.

@0xTim @gwynne what do you think?

[0xTim]

Yep lets do it as part of this PR since it's related

[alemohamad]

Check the comments, and then merge it. 👍