Configured Identity.API project to restore LibMan dependencies upon build

src/Services/Identity/Identity.API/Identity.API.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web" Tools="18.8.0">
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.1</TargetFramework>
@@ -24,6 +24,7 @@
     <PackageReference Include="IdentityServer4.AspNetIdentity" Version="2.1.0" />
     <PackageReference Include="IdentityServer4.EntityFramework" Version="2.1.1" />
     <PackageReference Include="Microsoft.AspNetCore.DataProtection.Redis" Version="0.3.3" />
+    <PackageReference Include="Microsoft.Web.LibraryManager.Build" Version="1.0.163" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="2.4.0" />
   </ItemGroup>