Andlw instruction (#5)

commands/Andlw.java

@@ -0,0 +1,22 @@
+package commands;
+
+import registers.Memory;
+
+public class Andlw extends CommandUtils implements Command
+{
+    private final int literal;
+
+    public Andlw(int input)
+    {
+        literal = input & 0x00FF;
+    }
+    @Override
+    public void execute()
+    {
+        int result = literal & Memory.workingRegister;
+
+        checkZeroBit(result);
+
+        Memory.workingRegister = result % 256;
+    }
+}