Add plot images.

plot/FPLOT.md

@@ -9,6 +9,17 @@ This was ported from the
 [lcd160cr-gui library](https://github.com/peterhinch/micropython-lcd160cr-gui).
 Like `nanogui.py` it uses synchronous code.
 
+![Image](images/cartesian.png) 
+Classic Cartesian plot.  
+![Image](images/discont.png)  
+Plot of discontinuous data.  
+![Image](images/lissajous.png)  
+A Lissajous figure.  
+![Image](images/sine.png)  
+Still from realtime simulation of reading and plotting data.  
+![Image](images/rpolar.png)  
+Still from realtime simulation of acquisition of polar data.  
+
 # Contents
 
  1. [Python files](./FPLOT.md#1-python-files)