add ui sample code

src/main.ino

@@ -30,6 +30,7 @@
 #include "MeshBluetoothService.h"
 #include "MeshService.h"
 #include "GPS.h"
+#include "screen.h"
 
 #ifdef T_BEAM_V10
 #include "axp20x.h"
@@ -353,10 +354,8 @@ void setup()
 
   // Show logo on first boot after removing battery
   //if (bootCount == 0) {
-  screen_print(APP_NAME " " APP_VERSION, 0, 0);
+  screen_print(APP_NAME " " APP_VERSION);
   screen_show_logo();
-  screen_update();
-  delay(LOGO_DELAY);
   //}
 
   service.init();
@@ -429,5 +428,5 @@ void loop()
 
   // No GPS lock yet, let the OS put the main CPU in low power mode for 100ms (or until another interrupt comes in)
   // i.e. don't just keep spinning in loop as fast as we can.
-  delay(100);
+  //delay(100);
 }