C++ conversion (#80)

Converted project to C++

Boards/YellowBoard/yellow_board.cpp

@@ -0,0 +1,17 @@
+#include "yellow_board.h"
+#include "display_i.h"
+
+bool twodotfour_lvgl_init();
+bool twodotfour_bootstrap();
+
+extern const tt::hal::sdcard::SdCard twodotfour_sdcard;
+
+const tt::hal::Configuration yellow_board_24inch_cap = {
+    .bootstrap = &twodotfour_bootstrap,
+    .init_graphics = &twodotfour_lvgl_init,
+    .display = {
+        .set_backlight_duty = &twodotfour_backlight_set
+    },
+    .sdcard = &twodotfour_sdcard,
+    .power = nullptr
+};