Create ContactsAdministration.md

Nagios contact changes documentation

Author: GRyall

doc/systems/nagios/ContactsAdministration.md

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+# Nagios Contacts
+## Viewing Nagios Contacts and contact groups
+To view currently configured Nagios contacts:
+
+1.  log into the Nagios web interface as `nagiosadmin`. 
+2. On the left hand menu, select `Configuration` under `System`.  
+3. Select either the `Contacts` Object Type to see configured contacts or `Contact Groups` to see the configured groups of contacts. 
+
+## Editing Nagios Contacts
+To edit contacts or contact groups:
+
+1. SSH into the Nagios host using the login details available in Keeper
+2. Nagios is in `/usr/local/nagios` with configuration of objects within `/usr/local/nagios/etc/objects/`
+3. Within that directory, edit contacts.cfg 
+4. restart the Nagios service:
+    `sudo service nagios reload`
+6. Check changes in the web interface as above