add a lib for rendering text in sdl2 and rules to make in makefile

SDL2_ttf/Xcode/showfont/SDL_uikit_main.c

@@ -0,0 +1,20 @@
+/*
+    SDL_uikit_main.c, placed in the public domain by Sam Lantinga  3/18/2019
+*/
+
+/* Include the SDL main definition header */
+#include "SDL_main.h"
+
+#ifndef SDL_MAIN_HANDLED
+#ifdef main
+#undef main
+#endif
+
+int
+main(int argc, char *argv[])
+{
+    return SDL_UIKitRunApp(argc, argv, SDL_main);
+}
+#endif /* !SDL_MAIN_HANDLED */
+
+/* vi: set ts=4 sw=4 expandtab: */