Update README.md

[MarsalekDesmotes]

Due to a small issue, you cannot log in with your microsoft account via the playfab editor extension. For a limited time, you can only log in directly with your playfab backsite account via the playfab editor extension.

[MarsalekDesmotes]

It's a temporary but annoying issue. People need to learn.

[nindim]

@MarsalekDesmotes - Do you know if this has been resolved now? We are all being pushed to migrate to Microsoft accounts to it's more important than ever that this works.

[MarsalekDesmotes]

@nindim no. you need to migrate to microsoft account.