dissect: add README and manpage
refs #2931
Change-Id: Ia0418fbf50725f004ceb09bcff9a55fb6136a70c
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+# ndn-dissect
+
+**ndn-dissect** is an NDN packet format inspector.
+It reads zero or more NDN packets from either an input file or the standard input,
+and displays the Type-Length-Value (TLV) structure of those packets on the standard output.
+
+Usage example:
+
+1. start NFD on local machine
+2. execute `echo 'HELLO WORLD' | ndnpoke ndn:/localhost/demo/hello`
+3. on another console, execute `ndnpeek ndn:/localhost/demo/hello | ndn-dissect`
+
+For more information, consult the manpage.