set up command structure using state pattern

src/main/java/cli/Controller.java

-package cli;
-
-public interface Controller {
-
-}

src/main/java/command/Command.java

+package command;
+
+public interface Command {
+    void execute();
+}

src/main/java/command/CommandCreateIssue.java

+package command;
+
+public class CommandCreateIssue implements Command {
+    public void execute() {
+        System.out.println("Issue Created!");
+    }
+}

src/main/java/command/CommandHelp.java

+package command;
+
+public class CommandHelp implements Command {
+
+    public void execute() {
+        System.out.println("HELP");
+    }
+}

src/main/java/command/CommandPushIssue.java

+package command;
+
+public class CommandPushIssue implements Command {
+    public void execute() {
+        System.out.println("Issue pushed");
+    }
+}

src/main/java/command/CommandSelector.java

+package command;
+
+public class CommandSelector {
+
+    private Command command = null;
+
+    public void executeCommand(String enteredCommand) {
+        if (enteredCommand.equals("issue")) {
+            command = createIssue();
+        } else if (enteredCommand.equals("push")) {
+            command = pushIssue();
+        } else {
+            command = help();
+        }
+
+        command.execute();
+    }
+
+    private Command help(){
+        return new CommandHelp();
+    }
+
+    private Command createIssue() {
+        return new CommandCreateIssue();
+    }
+
+    private Command pushIssue() {
+        return new CommandPushIssue();
+    }
+}