Add Nucleo H743ZI

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

README.md

@@ -103,6 +103,9 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
   * STM32F4
      * [ARMED V1](https://github.com/ktand/Armed)
 
+  * STM32H7
+    * [Nucleo H743ZI](https://www.st.com/en/evaluation-tools/nucleo-h743zi.html)
+
   * STM32L4
     * [Nucleo L412KB](http://www.st.com/en/evaluation-tools/nucleo-l412kb.html)