Add installation instructions on Vagrant (#711)

docs/installation/vagrant.md

@@ -0,0 +1,31 @@
+# Installing Monica using Vagrant
+
+If you want a quick and easy way to get a Monica development/test environment up and running without having to take care of the installation process yourself, you can create a pre-configured virtual machine using Vagrant.
+
+1. Download and install [Vagrant](https://www.vagrantup.com/) for your operating system
+2. Create a folder to put the vagrant configuration files
+3. Download the `Vagrantfile` and the `provision.sh` script from [this repository](https://github.com/dp87/vagrantfiles/tree/master/Monica)
+4. Put both of these files inside the Vagrant folder you have created in step 2
+5. Open a terminal and `cd` to this folder
+6. Initialize a virtual machine based on Ubuntu 16.04: `vagrant init ubuntu/xenial64`
+7. Launch the virtual machine with `vagrant up`
+
+The virtual machine will be first created and then provisioned using the `provision.sh` script, which will take care of installing Monica for you.
+
+Once the installation process is complete (you will see all of the output in your terminal window), you can either access the virtual machine by typing `vagrant ssh` in your terminal, or access the Monica web interface by opening `http://localhost:8080` in your browser on your host machine.
+
+## Default Monica configuration in the VM
+
+### Database users
+
+* Root database user
+* * Username: `root`
+* * Password: `changeme`
+* Monica database user
+* * Username: `monica`
+* * Password: `changeme`
+
+### Apache configuration
+
+* The project is installed in `/var/www/html/monica`
+* The root folder for the web server is `/var/www/html/monica/public`