Addlw instruction (#4)

* Added addlw command

* Write to program list

* Included CommandUtils as helpter class. Sorted classes into packages

* Revert changes on HelloWorld

* Revert "Revert changes on HelloWorld"

This reverts commit a08a336864fb2aa2bbc5a4e37ca360765774965e.

* Added example execution of Addlw command

parser/Parser.java

@@ -0,0 +1,33 @@
+package parser;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class Parser
+{
+    public static List<Integer> parser(String filePath)
+    {
+        ArrayList<Integer> program = new ArrayList<>();
+        try {
+            File file = new File(filePath);
+            Scanner scanner = new Scanner(file);
+            while (scanner.hasNextLine()) {
+                String data = scanner.nextLine();
+                if(!data.startsWith(" "))
+                {
+                    String commandAndParametersString = "0x" + data.split(" ")[1];
+                    int commandAndParameters = Integer.decode(commandAndParametersString);
+                    program.add(commandAndParameters);
+                }
+            }
+            scanner.close();
+        } catch (FileNotFoundException e) {
+            System.out.println("An error occurred.");
+            e.printStackTrace();
+        }
+        return program;
+    }
+}