Added Vagrantfile for build environment with Vagrant (#14)

* Added .vagrant to ignore

* Added Vagrantfile

* Added section for Vagrant

* made retry_count customizeable (default 20)

README.md

@@ -93,6 +93,13 @@ scp debian@master_ip:~/.kube/config ~/.kube/config
 
 See the commands [here](https://docs.technotim.live/posts/k3s-etcd-ansible/#testing-your-cluster).
 
+### Vagrant
+
+You may want to kickstart your k3s cluster by using Vagrant to quickly build you all needed VMs with one command.
+Head to the `vagrant` subfolder and type `vagrant up` to get your environment setup.
+After the VMs have got build, deploy k3s using the Ansible playbook `site.yml` by the
+`vagrant provision --provision-with ansible` command.
+
 ## Thanks 🤝
 This repo is really standing on the shoulders of giants.  To all those who have contributed.