Added dnstracer

tools/dnstracer.md

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+# dnstracer
+
+Notes
+-------
+
+Help Text
+-------
+```
+DNSTRACER version 1.8.1 - (c) Edwin Groothuis - http://www.mavetju.org
+Usage: dnstracer [options] [host]
+	-c: disable local caching, default enabled
+	-C: enable negative caching, default disabled
+	-o: enable overview of received answers, default disabled
+	-q <querytype>: query-type to use for the DNS requests, default A
+	-r <retries>: amount of retries for DNS requests, default 3
+	-s <server>: use this server for the initial request, default localhost
+	             If . is specified, A.ROOT-SERVERS.NET will be used.
+	-t <maximum timeout>: Limit time to wait per try
+	-v: verbose
+	-S <ip address>: use this source address.
+	-4: don't query IPv6 servers
+```
+
+Example Usage
+-------
+
+Links
+-------