Add sample PGSQl CDR config file (bug #447)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1792 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/cdr_pgsql.conf.sample

+; Sample Asterisk config file for CDR logging to PostgresSQL
+
+[global]
+;hostname=localhost
+;port=5432
+;dbname=asterisk
+;password=password
+;user=postgres