Is there a way to add System.Runtime.Caching?

Hello,

My Xamarin.Forms project uses a RESTful service to fetch client data from our servers. I would like to cache some of the responses and was looking to use the MemoryCache class that's a part of System.Runtime.Caching. So far I have tried to add the dll through Edit References -> .Net Assembly -> Browse and navigating to it. But after doing this, I get an error while rebuilding. Is there another way to add System.Runtime.Caching or is it completely incompatible with Xamarin.Forms? If so, what are some good alternatives?