copied and adapted example from mdk, added init and config uart

having a program that runs on esp32-c3

Should initilize and config uart according to technical reference

Transmitting a simple message to test our if we get it

src/simple-uart-transmit/Makefile

+SOURCES = main.c esp32-c3-uart-interface.c
+
+include $(MDK)/$(ARCH)/build.mk