Add caching

Author: lorensr

app/src/main/java/guide/graphql/toc/data/Apollo.kt

@@ -1,11 +1,17 @@
 packageguide.graphql.toc.data
 
 importcom.apollographql.apollo.ApolloClient
+importcom.apollographql.apollo.cache.normalized.lru.EvictionPolicy
+importcom.apollographql.apollo.cache.normalized.lru.LruNormalizedCacheFactory
 
 object Apollo{
 val client:ApolloClient by lazy{
+val cacheFactory =
+LruNormalizedCacheFactory(EvictionPolicy.builder().maxSizeBytes(10*1024*1024).build())
+
 ApolloClient.builder()
  .serverUrl("https://api.graphql.guide/graphql")
+ .normalizedCache(cacheFactory)
  .build()
  }
-}
+}