Updated config file with examples suitable for public release.

[icmpmonitor] / README

It was reported to compile and work on following platfoms:

BSDi 2.1
BSDi 3.1
FreeBSD 3.3-RC 
Solaris 2.7 sparc 
Solaris 2.6 sparc 
Solaris 2.6 x86
Solaris 2.5.1 sparc with GNU C 2.8.1
RedHat Linux 6.0-9
Slackware 6.0 (beta)
Slackware 4.0
MacOS 10.3.4