You can do this yourself in Chrome right now! Open the page you want to be an "app", and on the Chrome three-dot menu, select More Tools / Create Shortcut...

You can do this yourself in Chrome right now! Open the page you want to be an "app", and on the Chrome three-dot menu, select More Tools / Create Shortcut... Edit the name as you wish and check the "Open as window" checkbox, then click OK. Now you have a shortcut on your Start menu that works like any other app shortcut. You can pin it to the taskbar, save it to the desktop, any of the usual things. And when you open the app it will have its own window and its own icon on the taskbar. This works on Windows and Linux at least - have not tried it on macOS.