work on pro LED, add rainbow test

apps/pro-rainbow-test/app.c

@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <string.h>
+#include "watch.h"
+
+void app_init(void) {
+}
+
+void app_wake_from_backup(void) {
+}
+
+void app_setup(void) {
+    watch_enable_leds();
+}
+
+void app_prepare_for_standby(void) {
+}
+
+void app_wake_from_standby(void) {
+}
+
+bool app_loop(void) {
+    static uint8_t red = 0;
+    static uint8_t green = 0;
+    static uint8_t blue = 255;
+    static uint8_t phase = 0;
+
+    switch (phase) {
+        case 0:
+            red++;
+            if (red == 255) phase = 1;
+            break;
+        case 1:
+            green++;
+            if (green == 255) phase = 2;
+            break;
+        case 2:
+            red--;
+            if (red == 0) phase = 3;
+            break;
+        case 3:
+            blue++;
+            if (blue == 255) phase = 4;
+            break;
+        case 4:
+            green--;
+            if (green == 0) phase = 5;
+            break;
+        case 5:
+            red++;
+            if (red == 255) phase = 6;
+            break;
+        case 6:
+            blue--;
+            if (blue == 0) {
+                phase = 1;
+            }
+            break;
+    }
+
+    watch_set_led_color_rgb(red, green, blue);
+    delay_ms(2);
+
+    return false;
+}

apps/pro-rainbow-test/make/Makefile

@@ -0,0 +1,10 @@
+TOP = ../../..
+include $(TOP)/make.mk
+
+INCLUDES += \
+  -I../
+
+SRCS += \
+  ../app.c
+
+include $(TOP)/rules.mk