No warn on missing xml comments

Author: deanmarcussen

Common.props

@@ -8,6 +8,7 @@
     <VersionSuffix>preview</VersionSuffix>
     <VersionSuffix Condition="'$(VersionSuffix)'!='' AND '$(BuildNumber)' != ''">$(VersionSuffix)-$(BuildNumber)</VersionSuffix>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <NoWarn>$(NoWarn);CS1591</NoWarn>
     <LangVersion>Latest</LangVersion>
     <DebugType>portable</DebugType>
     <GenerateAssemblyTitleAttribute>false</GenerateAssemblyTitleAttribute>