chore: Add course material

397/DOS_Unix/Screen.h

@@ -0,0 +1,19 @@
+#ifndef SCREEN_H
+#define SCREEN_H
+
+#include <string>
+
+namespace Screen {
+const int BLACK = 0;
+const int GRAY = 8;   // FOREGROUND_INTENSITY;
+const int BLUE = 9;   // FOREGROUND_RED|FOREGROUND_INTENSITY
+const int GREEN = 10; // FOREGROUND_GREEN|FOREGROUND_INTENSITY;
+const int RED = 12;   // FOREGROUND_RED|FOREGROUND_INTENSITY
+const int YELLOW = RED | GREEN;
+const int WHITE = RED | GREEN | BLUE;
+const int BACKGROUND = 128; // OR (|) with the color value for gray background
+
+void write(std::string s, int x, int y, int color);
+};
+
+#endif