Update README.md

Author: zzwu29

README.md

@@ -1,5 +1,15 @@
 # compareNavPlot
-PySide2 UI for plotting IMU outputs, GNSS or GNSS/INS positioning results.
+**PySide2 UI for plotting IMU outputs, GNSS or GNSS/INS positioning results**
+
+---
+
+**Overview**
+
+![demo](demo.png)
+
+![ui](ui.png)
+
+---
 
 compareNavPlot.py --- plot control code
 
@@ -8,3 +18,4 @@ compareNavPlot.ui --- plot ui settings
 glv.py --- global variables
 
 tool_func.py --- significant functions for error comparision
+