First stab at a december display

harrogate/src/main.rs

@@ -5,12 +5,16 @@ use lights_hal::{boot, entry};
 
 pub use lights_hal::delay;
 
+mod december_2019;
 mod door_light;
 
 #[entry]
 fn main() -> ! {
     let mut lights = boot();
 
+    #[cfg(feature = "december-2019")]
+    december_2019::run(&mut lights);
+
     #[cfg(not(feature = "replace-default"))]
     door_light::run(&mut lights);
 }