added terminal app with example hello world

src/bin/HelloWorld.hx

@@ -0,0 +1,17 @@
+package bin;
+
+import lib.TermHandle;
+import kernel.fs.FileHandler.WriteHandle;
+import lib.CLIBase;
+
+class HelloWorld extends CLIBase {
+	public function invoke(handle: TermHandle):Bool {
+		var world:String = "world";
+		if (handle.args.length > 0) {
+			world = handle.args[0];
+		}
+
+		handle.write('Hello, $world!');
+		return true;
+	}
+}