Add skeleton architecture for displaying custom splash screen

fusee/fusee-secondary/src/nxboot.c

@@ -1,7 +1,14 @@
 #include "utils.h"
 #include "nxboot.h"
+#include "loader.h"
+#include "splash_screen.h"
 
 /* This is the main function responsible for booting Horizon. */
 void nxboot_main(void) {
+    loader_ctx_t *loader_ctx = get_loader_ctx();
+      
     /* TODO: Implement this function. */
+    
+    /* Display splash screen. */
+    display_splash_screen_bmp(loader_ctx->custom_splash_path);
 }