tools: nfdc help command

refs #3780

Change-Id: Ibd0e37bad127a38e582864fadd81afadc74baf48
diff --git a/docs/manpages/nfdc-status.rst b/docs/manpages/nfdc-status.rst
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+nfdc-status
+===========
+
+SYNOPSIS
+--------
+| nfdc status [show]
+| nfdc status report [<format>]
+
+DESCRIPTION
+-----------
+The **nfdc status show** command shows general status of NFD, including its version,
+uptime, data structure counters, and global packet counters.
+
+The **nfdc status report** command generates a comprehensive report of NFD status, including:
+
+- general status (individually available from **nfdc status show**)
+- list of channels (individually available from **nfdc channel list**)
+- list of faces (individually available from **nfdc face list**)
+- list of FIB entries (individually available from **nfdc fib list**)
+- list of RIB entries (individually available from **nfdc route list**)
+- list of strategy choices (individually available from **nfdc strategy list**)
+
+OPTIONS
+-------
+<format>
+    The format of NFD status report, either ``text`` or ``xml``.
+    The default is ``text``.
+
+SEE ALSO
+--------
+nfdc(1), nfdc-channel(1), nfdc-face(1), nfdc-fib(1), nfdc-route(1), nfdc-strategy(1)