Workers KV example

Their is an example in the readme for getting a value from a workers KV kew, but it is not clear on how the response is used. Can the example either be documented on what it is doing, or can a functional example be added that can be easily tested? I will gladly add clarification if needed.

Read the Workers KV example in the README first and determine how its response is intended to be used. Clarify that usage or add a functional example that can be tested; done means the README makes the response handling understandable and provides a verifiable example.

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