add script for creating VM image

lib/certbot.rb

@@ -0,0 +1,13 @@
+
+module Certbot
+
+  def self.create_certificate(domain, wildcard = false)
+    command = "/home/artur/.dat/bin/certbot"
+    if wildcard 
+      system "sudo #{command} certonly --manual --preferred-challenges=dns -d \"*.#{domain}\" -d \"#{domain}\""
+    else
+      system "sudo #{command} --nginx -d #{domain}"
+    end
+  end
+
+end