intro page should have a collaborative editing example

[skyebend]

Very excited to see the demo, but it took me a minute to figure out how to use it, even 'tho I know what EtherSheet is supposed to do. Its like it was so easy, it wasn't at all obvious to me that all I had to do was copy the url. So I think the page at https://ethersheet.org/ should have slightly more text for the demo to be useful. Something like

1. Name your spreadsheet:
2. Go to your sheet
3. Share the sheet url with your friends
4. You can all edit at the same time!

[cooperq]

This is a great Idea! We could add it to the default intro page text as well.