Add attributions for MIT files from Engineer's Decor

README.md

@@ -10,4 +10,6 @@ Wires, transformers, capacitors!
 # Asset Credits
 - Sound for the collapsible glider is by Iain McCurdy on [freesound.org](https://freesound.org/people/iainmccurdy/sounds/645974/), licensed under CC BY 4.0
 - Sound for the excavator ore conveyor is by tosha73 on [freesound.org](https://freesound.org/people/tosha73/sounds/584592/), licensed under CC BY 4.0
-- Sound for the electromagnet is by _MC5_ on [freesound.org](https://freesound.org/people/_MC5_/sounds/672082/), licensed under CC BY 4.0
+- Sound for the electromagnet is by _MC5_ on [freesound.org](https://freesound.org/people/_MC5_/sounds/672082/), licensed under CC BY 4.0
+- Assets for several blocks are derived from @stfwi assets in [Engineer's Decor](https://github.com/stfwi/engineers-decor), licensed under MIT
+    - These assets include clinker bricks, slag bricks, and grit sand