Update CONTRIBUTING.md (#2647)

* Update CONTRIBUTING.md * Update CONTRIBUTING.md
microsoft · Aug 2, 2022 · 288d344 · 288d344
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diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
@@ -21,13 +21,19 @@ To successfully build the sources on your machine, make sure you've installed th
 - Visual Studio 2022 Community, Professional or Enterprise
 - .NET SDKs (https://dotnet.microsoft.com/download)
     - .NET Framework 4.5.2
+    - .NET Framework 4.6.0
+    - .NET Framework 4.6.1
     - .NET Framework 4.6.2
     - .NET Framework 4.7.2
     - .NET Framework 4.8
     - .NET Core 3.1
     - .NET 6
     - .NET 7
 
+Note: .NET has an annual release cycle and we include the preview version in our test matrix.
+Visual Studio requires a setting to compile using these preview versions:
+  - Tools > Options > Environment > Preview Features > "Use previews of the .NET SDK".
+
 ## Build
 
 Solutions can be built in either Visual Studio or via .NET CLI `dotnet build` ([link](https://docs.microsoft.com/dotnet/core/tools/dotnet-build)).