Implemented serial for basic debugging, Added MMU enable to kernel main

src/kernel/arch/i386/ports/serial.cpp

@@ -0,0 +1,19 @@
+#include "serial.h"
+
+Serial Serial::init() {
+    // No clue what to setup yet!
+
+    return Serial();
+}
+
+void Serial::print(){
+    // Do nothing!
+}
+
+Serial::Serial(){
+    // Do nothing!
+}
+
+Serial::~Serial(){
+    // Do nothing!
+}