many things, cosmo build!

Player/Main/cosmo.c

@@ -0,0 +1,7 @@
+#include "../../Common/std.h"
+#include "../Display/display.h"
+#include <stdio.h>
+extern int main(int argc, char const *const *argv) {
+  com_std_write(COM_STD_OUTFD, "TEST?", sizeof "TEST?" - 1);
+  return plr_display_x11_main(argc, argv);
+}