Added example using NuGet Package Validation to detect breaking chang…

…es in the public api

See: https://devblogs.microsoft.com/dotnet/package-validation/

Sample/EventsVersioning/ECommerce.V1/ECommerce.V1.csproj

@@ -1,7 +1,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
+    <!--  Catches incompatibility with the NuGet.
+    Read more in: https://devblogs.microsoft.com/dotnet/package-validation/#validation-against-baseline-package-version
+    -->
+    <Sdk Name="Microsoft.DotNet.PackageValidation" Version="1.0.0-preview.5.21302.8" />
+
     <PropertyGroup>
         <TargetFramework>net8.0</TargetFramework>
+        <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+        <PackageId>Ecommerce.V1</PackageId>
+        <Version>1.0.0</Version>
+        <!-- Ucomment if you have NuGet published. Set it to the previous major version -->
+        <!-- <PackageValidationBaselineVersion>1.0.0</PackageValidationBaselineVersion>-->
     </PropertyGroup>
-
 </Project>