Explain in readme how to run the app

[page200]

When I download the the current code and open keys.htm, I see a white screen. With Release v1.2, the menus work but there is no sound.

Please explain in the README how to run the app. The online websites work for me, but the local copy doesn't. Thanks!

[page200]

For Release v1.2 of the original repo, sound works if I restart Chromium with the --allow-file-access-from-files flag as described here. (Without that flag, the Console said Access to XMLHttpRequesat at '.../sounds/organ110.mp3' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes:...)

What remains to be done is to find out how to get the new version to work and to add that info (or at least the info about Release v1.2) to the README.