Add build script and raylib starter main.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

main.c

@@ -0,0 +1,18 @@
+#include "raylib.h"
+
+int main(void)
+{
+    InitWindow(600, 400, "raylib [core] example - basic window");
+
+    while (!WindowShouldClose())
+    {
+        BeginDrawing();
+            ClearBackground(RAYWHITE);
+            DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
+        EndDrawing();
+    }
+
+    CloseWindow();
+
+    return 0;
+}