Prerequisites missing

Hi there, thanks for a great tool!

Not everyone here is a frontend developer, not everyone is on Mac etc. What is obvious to you is not clear to some of us at all! :-(

My suggestion is to add a Prerequisites section to the main page.

As an example, you could borrow something from [here](https://github.com/KulaginAnton/Backstop-Remote/blob/master/README.MD):

**Prerequisites**
- Nodejs 8.9.1 or higher
- Npm 5.5.1 or higher
- Chrome 62 or greater is required

Thanks again and stay healthy!

Start with the project's main page and compare its current setup guidance with the linked example. Identify the supported Node.js, npm, and Chrome prerequisites, add a clearly labeled Prerequisites section, and verify that the documented requirements match the project.

Written by the indexing model from the issue text.