Update README.md

Update README.md before Archive.

Author: JakeRadMSFT

README.md

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+# ProjFileTools Archived
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+This project was an experiment for older versions of Visual Studio that we have not carried forward in the same manner.
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+As part of creating transparency of the state of the repo, we are archiving this repo in current state. All issues will remain unresolved with regard to this source code.
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+For alternative extensions that are more recent we recommend looking at [MSBuild Editor](https://marketplace.visualstudio.com/items?itemName=mhutch.MSBuildEditor).
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+In addition, you may log feature suggestions on [Developer Community](https://developercommunity.visualstudio.com/VisualStudio) that can be upvoted by others to help us in our prioritization of different features that go into Visual Studio.
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+
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+---------------------------------------
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 # Project File Tools
 
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