With regards to a response cache, an example can be found here
https://github.com/apigee/api-platform-samples/tree/master/sample-proxies/response-cache
To create a cache there is a menu entry under the API’s pull down called environment configuration. Under that page you can find an area for cache’s, create your cache there. To reference said cache you need to include the name of the cache in a CacheResource tag in the response cache, lookup cache or populate cache policy
Happy hunting!