Documentation: Add requirement for pulumi access token

[TimBanks]

Installation for local dev container, after make kind, user is prompted for pulumi access token.

Pulumi account and valid access token should probably be listed in the requirements so that it's setup before installation.

[usrbinkat]

Corrected order of instructions on README.md and added pulumi cloud login/access token as a prereqs list item in 43cff8a

Closing in favor of addressing more pulumi state options during post MVP milestone alpha1 #25

[usrbinkat]

Thank you for your contribution!