added Double M33 Express to boards.md
@@ -86,6 +86,7 @@ This code base already had supported for a handful of following boards (sorted a
- [LPCXpresso 54114](https://www.nxp.com/design/microcontrollers-developer-resources/lpcxpresso-boards/lpcxpresso54114-board:OM13089)
- [LPCXpresso 55s69 EVK](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc5500-cortex-m33/lpcxpresso55s69-development-board:LPC55S69-EVK)
- [NGX LPC4330-Xplorer](https://www.nxp.com/design/designs/lpc4330-xplorer-board:OM13027)
+- [Double M33 Express](https://www.crowdsupply.com/steiert-solutions/double-m33-express)
### Sony
