Add TitleCommand to set terminal window title

See #13

Author: nihaltp

src/main/java/com/mycmd/App.java

@@ -51,5 +51,6 @@ private static void registerCommands(Map<String, Command> commands) {
         commands.put("help", new HelpCommand(commands));
         commands.put("exit", new ExitCommand());
         commands.put("ver", new VersionCommand());
+        commands.put("title", new TitleCommand());
     }
 }

src/main/java/com/mycmd/commands/TitleCommand.java

@@ -0,0 +1,15 @@
+package com.mycmd.commands;
+
+import com.mycmd.Command;
+import com.mycmd.ShellContext;
+
+public class TitleCommand implements Command {
+    @Override
+    public void execute(String[] args, ShellContext context) {
+        if (args.length > 0) {
+            String title = String.join(" ", args);
+            System.out.println("\033]0;" + title + "\007");
+        }
+    }
+    
+}