'foreman' is not recognized as an interal or external command-open source projects ddollar/foreman

I am trying to get started with Node.js on Windows.

All went good on localhost, so I decided to try heroku for hosting my app.

I followed this tutorial and everything goes well until the foreman start part, saying that

‘foreman’ is not recognized as an internal or external command, operable program or batch file.

I have tried installing/uninstalling foreman using npm, but nothing changed.

I would appreciate any help as I have been stuck on this since yesterday