Update .NET SDK version and add xunit.v3 example #300

Bump .NET SDK version to 9.0.302 in Azure Pipelines YAML files and update version variables. Add an example for referencing xunit.v3 in the README to improve documentation.

Author: Arash-Sabet

README.md

@@ -15,6 +15,12 @@ This library brings in Microsoft's dependency injection container to Xunit by le
 
 Also please check the [migration guide](https://xunit.net/docs/getting-started/v3/migration) from xUnit for test authors.
 
+### Example on how to reference xunit.v3
+
+```xml
+<PackageReference Include="xunit.v3" Version="2.0.3" />
+```
+
 ## Getting started
 
 ### Nuget package

azure-pipeline-PR.yml

@@ -17,7 +17,7 @@ steps:
   displayName: 'Use .NET 9.0 sdk'
   inputs:
     packageType: sdk
-    version: 9.0.301
+    version: 9.0.302
     installationPath: $(Agent.ToolsDirectory)/dotnet
 - script: echo Started restoring the source code
 - task: DotNetCoreCLI@2

azure-pipelines.yml

@@ -1,7 +1,7 @@
 variables:
   Major: 9
-  Minor: 0
-  Revision: 6
+  Minor: 1
+  Revision: 0
   BuildConfiguration: Release
 
 name: $(Major).$(Minor).$(Revision)
@@ -25,7 +25,7 @@ steps:
   displayName: 'Use .NET 9.0 sdk'
   inputs:
     packageType: sdk
-    version: 9.0.301
+    version: 9.0.302
     installationPath: $(Agent.ToolsDirectory)/dotnet
 - script: echo Started restoring the source code
 - task: DotNetCoreCLI@2