Add README.

README.md

+ZNC IRC Bouncer
+===============
+
+https://wiki.znc.in/ZNC
+
+```puppet
+# Adds a basic ZNC configuration
+include ::irc_bouncer
+
+# Adding this configures cyrusauth and SASL authentication, through PAM. 
+# Note that PAM needs to be configured separately.
+include ::irc_bouncer::sasl
+
+# Adds a basic identd instance
+include ::irc_bouncer::ident
+
+# Additional ZNC modules can be loaded through
+class irc_bouncer::module { 'extra-module':
+}
+```