Include documentation in the application

doc/vagrant.markdown

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+Run Kanboard with Vagrant
+=========================
+
+Vagrant is used to test Kanboard in different environments.
+
+Several configurations are available:
+
+- Ubuntu 14.04 LTS with Sqlite
+- Ubuntu 14.04 LTS with Mysql
+- Ubuntu 14.04 LTS with Postgresql
+- Debian 8 with sqlite
+- Debian 7.6 with Sqlite
+- Debian 6 with Sqlite
+- Centos 7 with Sqlite
+- Centos 6.5 with Sqlite
+- Freebsd 10 with Sqlite
+
+The installation process is not fully automated for all VM, manual configuration can be required.
+
+To use those configurations, you have to install the **last version of Virtualbox and Vagrant**.
+
+Standard boxes can be downloaded from Vagrant:
+
+```bash
+vagrant box add ubuntu/trusty64
+vagrant box add debian/jessie64
+vagrant box add chef/debian-7.6
+vagrant box add chef/debian-6.0.10
+vagrant box add chef/centos-7.0
+vagrant box add chef/centos-6.5
+vagrant box add freebsd/FreeBSD-10.2-STABLE
+```
+
+### Example with Ubuntu and Sqlite
+
+If you want to test Kanboard on Ubuntu with Sqlite:
+
+```bash
+vagrant up sqlite
+```
+
+Run composer:
+
+```bash
+vagrant ssh sqlite
+cd /var/www/html          # change the path according to the chosen distribution
+sudo composer install
+```
+
+After the initialization, go to **http://localhost:8001/**.
+
+If you want to use Postgresql or Mysql, you have to configure Kanboard manually (`config.php`) and configure the database inside the virtual machine.
+
+Available boxes are:
+
+- `vagrant up sqlite`
+- `vagrant up mysql`
+- `vagrant up postgres`
+- `vagrant up debian8`
+- `vagrant up debian7`
+- `vagrant up debian6`
+- `vagrant up centos7`
+- `vagrant up centos65`
+- `vagrant up freebsd10`