Improve vagrant-onap documentation

It was added the process to create documentation thru sphinx tool.
Now it's possible to generate all the documentation locally running:

$ tox -e docs

Lastly, the installation guide was included as a reference to
different methods to install requirements.

Change-Id: Id0b277d605cf83ddbde54ecd9f4648e1f89023c3
Signed-off-by: Victor Morales <victor.morales@intel.com>
diff --git a/bootstrap/vagrant-onap/doc/source/install/index.rst b/bootstrap/vagrant-onap/doc/source/install/index.rst
new file mode 100644
index 0000000..248c956
--- /dev/null
+++ b/bootstrap/vagrant-onap/doc/source/install/index.rst
@@ -0,0 +1,63 @@
+==================
+Installation Guide
+==================
+
+This project collects instructions related to the automatic creation
+of a development environment. However, this requires only two
+components previous to its execution.  These are an automation
+building tool (Vagrant) and a provider platform (VirtualBox, Libvirt
+and OpenStack). This section explains how to install the most common
+set of configuration(Vagrant/VirtualBox) in different Operating
+Systems.
+
+Ubuntu 14.04 ("Trusty")
+-----------------------
+
+.. code-block:: console
+
+    $ wget -q https://releases.hashicorp.com/vagrant/1.9.7/vagrant_1.9.7_x86_64.deb
+    $ sudo dpkg -i vagrant_1.9.7_x86_64.deb
+    $ echo "deb http://download.virtualbox.org/virtualbox/debian trusty contrib" >> /etc/apt/sources.list
+    $ wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
+    $ wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
+    $ sudo apt-get update -y
+    $ sudo apt-get install -y virtualbox-5.1 dkms
+
+.. end
+
+CentOS
+------
+
+.. code-block:: console
+
+    $ wget -q https://releases.hashicorp.com/vagrant/1.9.7/vagrant_1.9.7_x86_64.rpm
+    $ sudo yum install vagrant_1.9.7_x86_64.rpm
+    $ wget -q http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo -P /etc/yum.repos.d
+    $ sudo yum --enablerepo=epel install dkms
+    $ wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | rpm --import -
+    $ sudo yum install VirtualBox-5.1
+
+.. end
+
+Mac OS
+------
+
+.. code-block:: console
+
+    $ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+    $ brew cask install vagrant
+    $ brew cask install virtualbox
+
+.. end
+
+Windows 7+ (PowerShell v2+)
+---------------------------
+
+.. code-block:: console
+
+    PS C:\> Set-ExecutionPolicy AllSigned
+    PS C:\> iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
+    PS C:\> choco install vagrant
+    PS C:\> choco install virtualbox
+
+.. end