create input/output interfaces

IO/keyboard.sv

@@ -0,0 +1,15 @@
+package keyboard (
+    output [15:0]out
+);
+
+//TODO: attach the physical keyboard to the hdl keyboard using iverilog
+
+case(out)
+    1 :
+        out = 15'b0000000000000001;
+        break
+    default:
+    0 :
+        out = 15'b0000000000000000;
+        break;
+endcase