add simple serial output

c_os/user/devices/SerialOut.h

@@ -0,0 +1,28 @@
+#ifndef __SerialOut_Include_H_
+#define __SerialOut_Include_H_
+
+#include "kernel/interrupts/ISR.h"
+#include "kernel/IOport.h"
+
+// NOTE: I took this code from https://wiki.osdev.org/Serial_Ports
+
+class SerialOut {
+private:
+    const IOport com1;
+
+    SerialOut(const SerialOut& copy) = delete;
+
+    int serial_received();
+    int is_transmit_empty();
+
+public:
+    SerialOut() : com1(0x3f8) {}
+
+    int init() const;
+
+    char read();
+    void write(char a);
+    void write(char* a);
+};
+
+#endif