Improve README a bit.

README.md

@@ -1,4 +1,16 @@
 zabbix-cli
 ==========
 
-Command-line interface for Zabbix
+Command-line interface for the Zabbix monitoring system
+
+Zabbix-cli is a terminal client for managing some Zabbix
+administration tasks via the zabbix-API.
+
+The zabbix-cli code is distributed under the GNU General Public
+License 3 and it is written in Python. It has been developed and
+tested by members of the Department for IT Infrastructure at [the
+Center for Information Technology](https://www.usit.uio.no) at
+[the University of Oslo, Norway](https://www.uio.no/).
+
+The project home page is on [GitHub](https://github.com/usit-gd/zabbix-cli).
+Please report any issues or improvements there.