docs: add README file in spanish

[Villanuevand]

Checklist

• Issue number for this PR: Not found
• Docs included?: (yes)
• • README_es.md
• • install-and-setup_es.md
• Test units included?: (no)

Description

In this PR Im adding the README_es.md which is a copy of README.md translated to Spanish.
I would like to translate the full documentation to spanish progressively

Code sample

None

[Splaktar]

LGTM!

It would be nice to link to the docs.angular.lat guides once those are translated.

[Villanuevand]

@jamesdaniels
Just a heads up, Im taking back the work with this issue.

[Villanuevand]

List of docs to translate:

• Quickstart Commit: e12c835
• Upgrading to v7.0? Check out our guide Commit: 6aa203f
• Getting started with Google Analytics Commit: d6abd13
• Documents
• Collections
• Querying Collections
• Offline data
• Objects
• Lists
• Querying lists
• Getting started with Firebase Authentication
• Route users with AngularFire guards
• Getting started with Firebase Emulator Suite
• Getting started with Cloud Storage
• Getting started with Firebase Messaging
• Getting started with Callable Functions
• Deploy your application on Firebase Hosting
• Getting started with Angular Universal
• Deploying your Universal application on Cloud Functions for Firebase
• Prerendering your Universal application
• Installation and Setup with Ionic CLI
• Using AngularFire with Ionic 2
• Using AngularFire with Ionic 3

Probably we are missing some nested docs. 

[armando-navarro]

Thank you for the translation work; it's clear real care went into it. Closing because the PR is from several years ago, the README it translates has changed almost completely since, and the CLA check never completed, which blocks merging in any case. If you're still interested in a Spanish README against the current text, we'd be happy to discuss it in a fresh issue first so the work doesn't outdate again while in review.