"Add release notes and changelog to NuGet package open-telemetry#4895"

Author: RichardChukwu

README.md

@@ -175,6 +175,11 @@ To access packages, source code, and/or view a list of changes for all
 components in a release see:
 [Releases](https://github.com/open-telemetry/opentelemetry-dotnet/releases).
 
+## Changelog
+
+For detailed changes and version history, see the [Changelog](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/CHANGELOG.md).
+
+
 Nightly builds from this repo are published to [MyGet](https://www.myget.org),
 and can be installed using the
 `https://www.myget.org/F/opentelemetry/api/v3/index.json` source.

src/OpenTelemetry/OpenTelemetry.csproj

@@ -26,4 +26,10 @@
     <Compile Include="$(RepoRoot)\src\Shared\ThreadSafeRandom.cs" Link="Includes\ThreadSafeRandom.cs" />
   </ItemGroup>
 
+  <PropertyGroup>
+  <PackageReadmeFile>README.md</PackageReadmeFile>
+  <PackageReleaseNotes>RELEASENOTES.md</PackageReleaseNotes>
+</PropertyGroup>
+
+
 </Project>