PackageLicense: Removes PackageLicenseUrl and Adds PackageLicenseFile…

… since PackageLicenseUrl is deprecated (#3847)

* proposal to add PackageLicenseFile since PackageLicenseUrl is deprecated. NuGet/Home#4628

* adding attribute Visible=false

Microsoft.Azure.Cosmos/src/Microsoft.Azure.Cosmos.csproj

@@ -24,7 +24,6 @@
 		<PackageId>Microsoft.Azure.Cosmos</PackageId>
 		<PackageTags>microsoft;azure;cosmos;cosmosdb;documentdb;docdb;nosql;azureofficial;dotnetcore;netcore;netstandard</PackageTags>
 		<PackageReleaseNotes>The change log for this SDK is made available at https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/changelog.md at the time of release.</PackageReleaseNotes>
-		<PackageLicenseUrl>https://aka.ms/netcoregaeula</PackageLicenseUrl>
 		<PackageProjectUrl>https://github.com/Azure/azure-cosmos-dotnet-v3</PackageProjectUrl>
 		<PublishRepositoryUrl Condition=" '$(ProjectRef)' != 'True' ">true</PublishRepositoryUrl>
 		<PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288890</PackageIconUrl>
@@ -43,8 +42,13 @@
 		<NoWarn>NU5125</NoWarn>
 		<Optimize Condition="'$(Configuration)'=='Release'">true</Optimize>
 		<LangVersion>$(LangVersion)</LangVersion>
+		<PackageLicenseFile>LICENSE</PackageLicenseFile>
 	</PropertyGroup>
 
+	<ItemGroup>
+		<None Include="..\..\LICENSE" Pack="true" PackagePath="" Visible="false"/>
+	</ItemGroup>
+
 	<ItemGroup>
 		<AdditionalFiles Include="stylecop.json" />
 		<None Include="Icon.png" Pack="true" PackagePath="\" />