Visualstudio-docs: Include info on how to pass and use Output values

[fiksen99]

None of the examples include outputs, it would be helpful to demonstrate how this is used.

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 1dbbe593-3f96-ce66-ceb3-0f7e6161dba9
• Version Independent ID: 3afb0fe4-6c5a-e899-61e1-37cd33963eba
• Content: Task Writing - Visual Studio
• Content Source: docs/msbuild/task-writing.md
• Product: visual-studio-dev15
• GitHub Login: @Mikejo5000
• Microsoft Alias: mikejo

[dotMorten]

Agreed! Also working it input/output of a collection items/itemsgroups

[Mikejo5000]

2809 also shows a request for an updated sample

[Mikejo5000]

Currently out of scope to add additional examples. See #2809

[dotMorten]

How's that out of scope to add a clearly missing example on a key feature in this doc?

[Mikejo5000]

I mean out of scope based on our current available resources. If you would like to open a PR with an example, I can get it reviewed.