Add local Debian installation instructions

docs/en/getting_started/prerequisites/debian.md

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+# Configuration for development and test environments (Debian 9.8)
+
+## Superuser
+
+Note that 'sudo' is not installed by default in Debian. It's possible to install and configure it, you can find information [here](https://wiki.debian.org/sudo). But  we don't recommend it cause you may have other problems. We recommend running the following commands as a superuser, so make sure the very first command you run is:
+
+```
+su
+```
+
+## Git
+
+Git is officially maintained in Debian:
+
+```
+apt-get install git
+```
+
+## Curl
+
+Curl is officially maintained in Debian:
+
+```
+apt-get install curl
+```
+
+## Ruby
+
+Ruby versions packaged in official repositories are not suitable to work with consul, so we'll have to install it manually.
+
+The preferred method is via rvm:
+
+```
+command curl -sSL https://rvm.io/mpapis.asc | gpg --import -
+command curl -sSL https://rvm.io/pkuczynski.asc | gpg --import -
+curl -L https://get.rvm.io | bash -s stable
+```
+
+then add rvm script source to user's bash (/root/.bashrc)
+
+```
+[[ -s /usr/local/rvm/scripts/rvm ]] && source /usr/local/rvm/scripts/rvm
+```
+
+and finally, reload .bashrc to be able to run RVM
+
+```
+source /root/.bashrc
+```
+
+with all this, you are suppose to be able to install a ruby version from rvm, as for example version 2.3.2:
+
+```
+rvm install 2.3.2
+```
+
+## Bundler
+
+Install it with
+
+```
+gem install rubygems-bundler
+```
+
+## Node.js
+
+To compile the assets, you'll need a JavaScript runtime. Node.js is the preferred option. As with Ruby, we don't recommend installing Node from your distro's repositories.
+
+To install it, you can use [n](https://github.com/tj/n)
+
+Run the following command on your terminal:
+
+```
+curl -L https://git.io/n-install | bash -s -- -y lts
+```
+
+And it will install the latest LTS (Long Term Support) Node version on your `$HOME` folder automatically (This makes use of [n-install](https://github.com/mklement0/n-install))
+
+Reload .bashrc to be able to run node
+
+```
+source /root/.bashrc
+```
+
+Check it's correctly installed by running:
+
+```
+node -v
+```
+
+## PostgreSQL (>=9.4)
+
+PostgreSQL version 9.4 is not official in debian 9.
+
+So you have to add a repository, the official postgresql works fine.
+
+Add the repository to apt, for example creating file */etc/apt/sources.list.d/pgdg.list* with:
+
+```
+deb http://security.debian.org/debian-security jessie/updates main
+```
+
+afterwards you'll have to download the key, and install it, by:
+
+```
+wget https://www.postgresql.org/media/keys/ACCC4CF8.asc
+apt-key add ACCC4CF8.asc
+```
+
+and install postgresql
+
+```
+apt-get update
+apt-get install postgresql-9.4 postgresql-server-dev-9.4 postgresql-contrib-9.4
+```
+
+You also need to configure a user for your database. As an example, we'll choose the username "consul":
+
+```
+su - postgres
+
+createuser consul --createdb --superuser --pwprompt
+
+exit
+```
+
+## ChromeDriver
+
+To run E2E integration tests, we use Selenium along with Headless Chrome.
+
+To get it working, install the chromedriver package:
+
+```bash
+apt-get install chromedriver
+ln -s /usr/lib/chromedriver /usr/local/bin/
+```
+
+Make sure it's working as expected by running the following command:
+
+```bash
+chromedriver --version
+```
+
+You should receive an output with the latest version of ChromeDriver. If that's the case, you're good to go!
+
+> Now you're ready to go get Consul [installed](../local_installation.html)!!