Added a basic Amanda configuration

Created a new backup virtual machine server called "backups" with a
simple configuration using the Getting Started with Amanda tutorial.
README also updated to reflect new workflow.

code/environments/production/Puppetfile

@@ -2,6 +2,7 @@ forge "http://forge.puppetlabs.com"
 
 # Custom
 mod 'wordpress', local: true
+mod 'amanda', local: true
 
 # Forge Mods
 mod 'puppetlabs-apache', '4.0.0' # Supported