Update caching.md

[jwalton922]

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I think it would be very beneficial to explicitly show how to use Memcached, Redis, or a custom implementation to do response caching using the gateway. It was not obvious to me that this would work as I only know basic Javascript.

Hopefully the code sample I suggested added works. I know in my project, I could not use the import statement and instead had to use require...so not sure if that's quite right, but I think even the statement I added would have helped me get to where I needed to go much faster! Based on a few stack overflow questions, I think it could help others.

[apollo-cla]

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[glasser]

Does the link immediately above your new text not help you?

Note that it suggests passing the cache to new ApolloServer rather than to the response cache plugin; that will allow the same cache to be used by other cache-based features like automatic persisted queries and REST data sources (and other plugins that want a cache).

[glasser]

We've significantly rewritten the caching docs including a full page on cache backends. If this doesn't address your concerns let me know!