Add link to build within Nuget package (#926)

* Add link to build within Nuget package

* Update buildID to build uri

* add url prefix to build id

Author: jignparm

csharp/src/Microsoft.ML.OnnxRuntime/Microsoft.ML.OnnxRuntime.csproj

@@ -23,6 +23,12 @@
     <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
     <PackageIconUrl>https://go.microsoft.com/fwlink/?linkid=2049168</PackageIconUrl>
+    <PackageReleaseNotes>
+        Release Def:
+	Branch: $(BUILD_SOURCEBRANCH)
+	Commit: $(BUILD_SOURCEVERSION)
+	Build: https://aiinfra.visualstudio.com/Lotus/_build/results?buildId=$(BUILD_BUILDID)
+    </PackageReleaseNotes>
 
     <!-- sourcelink flags -->
     <PublishRepositoryUrl>true</PublishRepositoryUrl>