add README.md

Author: David Heidelberger

README.md

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+[![Build Status](https://travis-ci.org/iputils/iputils.png?branch=master)](https://travis-ci.org/iputils/iputils)
+
+The iputils package is set of small useful utilities for Linux networking.
+
+These tools are included in iputils
+- arping
+- clockdiff
+- ipg
+- ping
+- ping6
+- rarpd
+- rdisc
+- tftpd
+- tracepath
+- tracepath6
+- traceroute6
+
+If you using [old version](http://www.skbuff.net/iputils/), please consider to move forward to new releases placed here.
+
+This version also support fully support both glibc and musl-libc.
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+<!-- vim: set tw=80: -->
+