Create VS Code workspace files

[joshsmithxrm]

Summary

Create workspace files for development scenarios.

Files to Create

1. ppds/ppds.code-workspace (mono repo)

For working within the PPDS mono repo only:

• Extension
• CLI/TUI
• NuGet libraries
• Tests

2. C:\VS\ppds-ecosystem.code-workspace (multi-repo)

For working across the entire ecosystem:

• ppds (mono repo)
• ppds-docs
• ppds-alm
• ppds-tools
• ppds-demo

This file lives outside repos (not checked in).

Tasks

• Create ppds.code-workspace in mono repo
• Create ppds-ecosystem.code-workspace template
• Document in CONTRIBUTING or README

Priority: Low

Nice to have for developer ergonomics.