Add todo item

Author: JunTaoLuo

src/Microsoft.AspNetCore.ResponseCaching/ResponseCachingContext.cs

@@ -515,6 +515,7 @@ internal bool ConditionalRequestSatisfied(ResponseHeaders cachedResponseHeaders)
                 {
                     foreach (var tag in RequestHeaders.IfNoneMatch)
                     {
+                        // TODO: use strong comparison
                         if (cachedResponseHeaders.ETag.Equals(tag))
                         {
                             return true;