Add examples for NXP JN516x using TSCH

examples/jn516x/tsch/simple-sensor-network/README.md

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+This example shows a simple sensor network consisting of node(s),an rpl-border-router and a host connected to
+the IPv6 network. The nodes (see also node/README.md) regularly transmit simulated sensor data to the host.
+The host visualises the received data. 
+
+The Python script tools/Output-Visualisation.py visualises the received data from the nodes.
+The script runs on Python27 and uses gnuplot for visualisation. 
+The following installations are needed (tested with Win32 versions:
+- Python 27 (https://www.python.org/download/releases/2.7/)
+- gnuplot (http://sourceforge.net/projects/gnuplot/files/gnuplot/)
+- gnuplot.py (http://gnuplot-py.sourceforge.net/)
+- numpy.py (e.g. http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy)
+Manual modification:
+Python27\Lib\site-packages\Gnuplot\gp_win32.py
+Modify gnuplot_command as in example below
+    gnuplot_command = r'"C:\Program Files (x86)\gnuplot\bin\gnuplot.exe"'
+
+- The IPv6 addresses of nodes need to be entered in the dictionary "node_data" of tools/Output-Visualisation.py
+  A user name for the node can be entered in this table as well.
+- The script will send a ping message to the next node in the list every 5 seconds. The nodes will obtain
+  the IPv6 address from this message and start sending "sensor" data to the host.
+- Received sensor data is plotted. When no data has been received for more than 30seconds, the plot line
+  will be dashed. 
+- Plots are updated once per second.
+ 
+