To get started with IncludeOS development on a Vagrant, you should install Vagrant and virtualbox (or VMware) as instructed.
After that clone the IncludeOS repo. This will be the basis for bringing up the Vagrant box.
$ git clone https://github.com/includeos/IncludeOS
$ cd IncludeOS/etc
$ vagrant up
$ vagrant ssh
Test the vagrant box installation by creating your first IncludeOS service. Inside Vagrant IncludeOS has been built with profile 'clang-6.0-linux-x86_64', use this profile to create the Hello World service. See README.