docs(project): why, what, how...

[darcyclarke]

Summary

Many people propose new features/changes to the npm CLI based on their own unique interpretations/understandings/motivations.

Exit Criteria

• [ ] document goals
• [ ] document motivations
• [ ] document standards
• [ ] document assumptions
• [ ] document known unknowns
• [ ] document known historical decisions
• [ ] document known best practices
• [ ] document known anti-patterns