Merge PR #398 - add simon game watch face

Adds a watch face that allows playing the classic Simon game
with the watch's buzzer and RGB LED.

Reviewed-by: Matheus Afonso Martins Moreira <matheus@matheusmoreira.com>
GitHub-Pull-Request: https://github.com/joeycastillo/Sensor-Watch/pull/398

make.mk

@@ -215,6 +215,20 @@ SRCS += \
 
 endif
 
+ifeq ($(LED), BLUE)
+CFLAGS += -DWATCH_IS_BLUE_BOARD
+endif
+
+ifndef COLOR
+$(error Set the COLOR variable to RED, BLUE, or GREEN depending on what board you have.)
+endif
+
+COLOR_VALID := $(filter $(COLOR),RED BLUE GREEN)
+
+ifeq ($(COLOR_VALID),)
+$(error COLOR must be RED, BLUE, or GREEN)
+endif
+
 ifeq ($(COLOR), BLUE)
 CFLAGS += -DWATCH_IS_BLUE_BOARD
 endif