Exercise 3: Build a Multi-Root Workspace — Possible Solution
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STEPS
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1. File -> Open Folder... and open a first project (Project A).
2. File -> Add Folder to Workspace... and select a second, unrelated
   folder (Project B). The Explorer's Side Bar now shows TWO
   top-level root folders, Project A and Project B, each with its own
   expandable file tree.
3. File -> Save Workspace As... and save it as, for example,
   my-projects.code-workspace, in a convenient location.
4. File -> Close Folder (or close the window entirely).
5. Reopen VS Code, then File -> Open Workspace from File... and select
   the my-projects.code-workspace file you just saved.
6. Confirm both Project A and Project B reappear in the Explorer,
   exactly as they were before closing.

WHAT TO NOTE
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The .code-workspace file itself is a small JSON file (openable in a
text editor) listing the paths to both root folders, plus any
workspace-level settings — it's the saved RECORD of the combination,
not the folders' actual content.

WHY THIS WORKS AS AN ANSWER
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This reuses the chapter's own three commands in the exact order it
describes them: Add Folder to Workspace to combine two unrelated
folders into one window (rather than the single-folder default from
Chapter 1's "Opening a Folder vs. a File"), then Save Workspace As to
persist that specific combination for later.

Successfully reopening BOTH folders together from the saved
.code-workspace file — rather than needing to manually re-add the
second folder every time — is what proves the multi-root workspace
was actually saved correctly, not just temporarily combined for the
current session.