Spanish documentation done

[luisejrobles]

**What kind of change does this PR introduce?
Docs update ... README translated to spanish

What is the current behavior? (You can also link to an open issue here)
#430 Spanish documentation

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change?

Please check if the PR fulfills these requirements

• This PR is against the develop branch. (Please do not submit PR's to the master branch)
• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[dalelotts]

Thanks for the PR! Nice work! Can I ask for a change before I merge this?

Can you please split the Spanish and English files? I think the way to do this is to create a new readme.es_MX.md (for Mexican Spanish) and then add a link to the existing readme.md to link to the new readme.es_MX.md?

[luisejrobles]

was a pleasure helping you out and of course ! I'm going to make the changes after I get out from the job

[luisejrobles]

@dalelotts just to make sure, you want me to create another readme with the name readme.es_MX.md and put in a link to the us version and viceversa?

[dalelotts]

I think linking both directions would be best. Something like this readme.md

[luisejrobles]

I'll do it in the night or tomorrow

[luisejrobles]

Done @dalelotts 👌

[dalelotts]

Looks great! Thank you so much!!

[dalelotts]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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