add an example app structe

src/my-ttgo-watch.ino

@@ -34,6 +34,7 @@
 #include "hardware/wifictl.h"
 
 #include "app/weather/weather.h"
+#include "app/example_app/example_app.h"
 
 TTGOClass *ttgo = TTGOClass::getWatch();
 
@@ -74,6 +75,7 @@ void setup()
      * add apps and widgets here!!!
      */
     weather_app_setup();
+    example_app_setup();
     /*
      *
      */