add 'dnsperf'

- signed-off-by: trimstray <trimstray@gmail.com>

README.md

@@ -233,6 +233,7 @@ Only main chapters:
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/google/namebench"><b>namebench</b></a> - provides personalized DNS server recommendations based on your browsing history.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/blechschmidt/massdns"><b>massdns</b></a> - is a high-performance DNS stub resolver for bulk lookups and reconnaissance.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/guelfoweb/knock"><b>knock</b></a> - is a tool to enumerate subdomains on a target domain through a wordlist.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/DNS-OARC/dnsperf"><b>dnsperf</b></a> - DNS performance testing tools.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/jedisct1/dnscrypt-proxy"><b>dnscrypt-proxy 2</b></a> - a flexible DNS proxy, with support for encrypted DNS protocols.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dnsdb/dnsdbq"><b>dnsdbq</b></a> - API client providing access to passive DNS database systems (pDNS at Farsight Security, CIRCL pDNS).<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/looterz/grimd"><b>grimd</b></a> - fast dns proxy, built to black-hole internet advertisements and malware servers.<br>