implemented Rlf Instruction (#20)

Co-authored-by: Darkress <30271678+DarkressX@users.noreply.github.com>
Reviewed-on: darkress/pic16f84-sim#20

de/darkress/pic16f84sim/decoder/CommandDecoder.java

@@ -27,8 +27,7 @@ public class CommandDecoder
             case 0x800:
                 return new Movf(input);
             case 0xD00:
-                //rlf();
-                break;
+                return new Rlf(input);
             case 0xC00:
                 //rrf();
                 break;