Add basic implementation for bitmap font

include/BitmapFont.h

@@ -0,0 +1,25 @@
+#ifndef BITMAP_FONT_H
+#define BITMAP_FONT_H
+
+#include "AssetManager.h"
+#include "Renderer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif // !__cplusplus
+
+typedef struct bitmap_font BitmapFont;
+
+BitmapFont *load_bitmap_font(AssetManager *am, const Renderer *renderer,
+                             const char *filepath, u64 tile_width,
+                             u64 tile_height);
+
+RenderRect get_character_sprite(BitmapFont *font, u64 index);
+
+void unload_bitmap_font(AssetManager *am, BitmapFont **font);
+
+#ifdef __cplusplus
+}
+#endif // !__cplusplus
+
+#endif // !BITMAP_FONT_H