Add GreetCommand

src/main/java/seedu/address/logic/commands/GreetCommand.java

@@ -0,0 +1,20 @@
+package seedu.address.logic.commands;
+
+import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.model.Model;
+
+import static java.util.Objects.requireNonNull;
+
+public class GreetCommand extends Command {
+
+    public static final String COMMAND_WORD = "greet";
+
+    public static final String MESSAGE_SUCCESS = "Hello!! ^_^";
+
+    @Override
+    public CommandResult execute(Model model) throws CommandException {
+        requireNonNull(model);
+
+        return new CommandResult(MESSAGE_SUCCESS);
+    }
+}

src/main/java/seedu/address/logic/parser/AddressBookParser.java

@@ -8,15 +8,7 @@
 import java.util.regex.Pattern;
 
 import seedu.address.commons.core.LogsCenter;
-import seedu.address.logic.commands.AddCommand;
-import seedu.address.logic.commands.ClearCommand;
-import seedu.address.logic.commands.Command;
-import seedu.address.logic.commands.DeleteCommand;
-import seedu.address.logic.commands.EditCommand;
-import seedu.address.logic.commands.ExitCommand;
-import seedu.address.logic.commands.FindCommand;
-import seedu.address.logic.commands.HelpCommand;
-import seedu.address.logic.commands.ListCommand;
+import seedu.address.logic.commands.*;
 import seedu.address.logic.parser.exceptions.ParseException;
 
 /**
@@ -53,6 +45,9 @@ public Command parseCommand(String userInput) throws ParseException {
 
         switch (commandWord) {
 
+        case GreetCommand.COMMAND_WORD:
+            return new GreetCommand();
+
         case AddCommand.COMMAND_WORD:
             return new AddCommandParser().parse(arguments);