Add README

Related with #4

README.md

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+
+# Decidim Documentation 
+
+This is the new repository for the [Decidim Documentation website](https://antora.org/):
+
+Is built with [Antora](https://antora.org/), although for this version we're going to try to not have multi-repositories, as it's a hassle to work with. The idea is to have all the documents living on this same repository. 
+
+This project is on active development and it's not on production yet.
+
+For working with it, you can do it several ways: 
+
+## Install locally 
+
+### Docker
+
+You can check this locally and install with Docker. For doing this, you'll need to have Docker and docker-compose installed. 
+
+```bash
+git clone https://github.com/decidim/docs-base
+cd docs-base
+docker-compose up
+cd build/site/decidim/
+xdg-open index.html
+```
+
+### Manually
+
+You can also work with this repository manually. For this you'll need nodeJS installed. We recommend using nvm for managing versions.
+
+```bash
+git clone https://github.com/decidim/docs-base
+cd docs-base
+npm i -g @antora/cli @antora/site-generator-default
+antora antora-playbook.yml
+cd build/site/decidim/
+xdg-open index.html
+```
+
+## Roadmap 
+
+This is a work in progress. This will be on production when we finish all the issues on the [MVP Milestone](https://github.com/decidim/docs-base/milestone/1).