Add documentation for CLI prompt

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2841 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/doc/README.cliprompt b/doc/README.cliprompt
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+* Changing the CLI Prompt
+-------------------------
+
+The CLI prompt is set with the ASTERISK_PROMPT UNIX environment variable that
+you set from the Unix shell before starting Asterisk
+
+You may include the following variables, that will be replaced by
+the current value by Asterisk:
+
+%d     Date (year-month-date)
+%h     Hostname
+%t     Time
+%%     Percent sign
+%#     '#' if Asterisk is run in console mode, '>' if running as remote console
+
+On Linux systems, you may also use
+%l     Load average on your system
+
+
+-----
+04-03-26