MPAE-19376 - adding header to readme.md

Author: jason-layton

README.md

@@ -77,7 +77,7 @@ In MCC, select RE0 as the output pin, as shown in [Figure 7](#figure-7) below. I
 
 ![MCC Pin Renaming](images/pin_name.png)<br>
 
-### Code setup
+## Code setup
 For the complete application code and a comprehensive description of the implementation, please refer to [main.c](\RGB_WS2812B.X\main.c).
 
 ## Operation