Images added

Author: mcmchris

content/hardware/07.opta/opta-family/opta/tutorials/18.smart-compressor-app-note/assets/materials.png renamed to content/hardware/07.opta/opta-family/opta/tutorials/18.smart-compressor-app-note/assets/material.png

@@ -33,7 +33,7 @@ The goal of this application note is to showcase the Opta PLC capabilities on le
 
 ## Hardware and Software Requirements
 
-![Hardware Image](assets/materials.png)
+![Hardware Image](assets/material.png)
 
 ### Hardware Requirements