Add start of emulator, debugger
diff --git a/dbg.h b/dbg.h
new file mode 100644
index 0000000..c31c1c3
--- /dev/null
+++ b/dbg.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include "cpu.h"
+
+void debug(cpu_t *cpu);