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

SDL2_ttf/cmake/test/main.c

@@ -0,0 +1,18 @@
+#define SDL_MAIN_HANDLED
+#include "SDL.h"
+#include "SDL_ttf.h"
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+    SDL_SetMainReady();
+    if (SDL_Init(0) < 0) {
+        fprintf(stderr, "could not initialize sdl2: %s\n", SDL_GetError());
+        return 1;
+    }
+    if (TTF_Init() == -1) {
+        fprintf(stderr, "TTF_Init: %s\n", TTF_GetError());
+    }
+    TTF_Quit();
+    SDL_Quit();
+    return 0;
+}