hardware image added

Author: mcmchris

content/hardware/06.nicla/boards/nicla-sense-env/tutorials/03.elevator-monitoring-application-note/assets/hardware.png

@@ -39,7 +39,7 @@ The project showcased in this application note has the following objectives:
 
 ## Hardware and Software Requirements
 
-![Hardware needed for the project]()
+![Hardware needed for the project](assets/hardware.png)
 
 ### Hardware Requirements