[add] opdracht 4.1

Microcontrollers/opdracht 4.1/lcd_control.h

@@ -22,6 +22,7 @@ void init_4bits_mode(void);
 void lcd_write_string(const char *str);
 void lcd_write_character(unsigned char byte);
 void lcd_write_command(unsigned char byte);
+void lcd_write_integer(int number);
 void lcd_move_right(void);
 void lcd_clear();