Added all files

examples/extra_vagrant_files/essential_box/Vagrantfile

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+Vagrant.configure(2) do |config|
+  config.vm.box = "bento/ubuntu-18.04"
+  config.vm.network "private_network", ip: "192.168.33.10"
+  config.vm.hostname = "client.vagrant.local"
+  config.vm.provision :shell, :path => "install.sh"
+  config.vm.provider "virtualbox" do |v|
+    v.memory = 512
+    v.cpus = 1
+    v.name = "webserver"
+  end
+end

examples/extra_vagrant_files/essential_box/install.sh

@@ -0,0 +1,3 @@
+set -eux
+apt-get update
+apt-get install -y --no-install-recommends ansible