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

SDL2_ttf/VisualC/clean.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+find . -type f \( -name '*.user' -o -name '*.sdf' -o -name '*.ncb' -o -name '*.suo' \) -print -delete
+rm -rvf Win32 */Win32 x64 */x64