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Cache Add/Get

A cache stores data so that future requests for that data can be served faster. We'll use one to keep PokeAPI responses in memory. No need to make the same network request twice!

First, we need a way to store and retrieve entries. I used a Cache struct with a map[string][]byte: the key identifies the data, and the value holds the raw bytes. The cache doesn't need to know anything about Pokemon or JSON.

Assignment

Create an internal package called pokecache with a Cache struct and a NewCache() function that initializes its map.
Add an Add(key string, val []byte) method. Adding an existing key should replace its value.
Add a Get(key string) ([]byte, bool) method. Return the stored bytes and true when the key exists, or nil and false when it doesn't.
Write tests for adding and retrieving entries, missing keys, and replacing a value. Keep different keys in the same cache to check that they don't overwrite each other.

We'll add expiration and connect the cache to the PokeAPI in the next lessons. For now, map and mapb should work as before.

Run and submit the CLI tests from the root of the repo.