Add setup steps for Windows users

[bruceme]

Please consider these alterations for windows users, there's quite a bit that needs to be set up before you can run scenic on windows

Description

Motivation and Context

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist

• [ ] Check other PRs and make sure that the changes are not done yet.
• [x] The PR title is no longer than 64 characters.