docs: Documentation updates

Change-Id: I7e10ba6bd1f70e779d5c2fc0437ff0f15828b312
Refs: #1923
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+nlsr
+====
+
+Usage
+-----
+
+::
+
+    nlsr [options]
+
+
+Description
+-----------
+
+``nlsr`` is a daemon that implements routing protocol in NDN to populates NDN's Routing
+Information Base.
+
+Options:
+--------
+
+
+``-d``
+  Run in daemon mode
+
+``-f <FILE>``
+  Specify configuration file name (default: ``./nlsr.conf``)
+
+``-V``
+  Display version information
+
+``-h``
+  Display this help message
+
+Examples
+--------
+
+To run NLSR daemon and use a configuration file from the ``/path/to`` directory.
+
+::
+
+    nlsr -f /path/to/nlsr.conf
+
+To run NLSR as daemon, use the ``-d`` flag:
+
+::
+
+    nlsr -d