opensearch: OpenSearch descriptor

curl 'https://standardebooks.org/opensearch'

import requests

resp = requests.get("https://standardebooks.org/opensearch")
data = resp.json()

import zingu_apis

api = zingu_apis.api("standardebooks")
result = api.fetch("opensearch")

for item in result:
    print(item)

const resp = await fetch("https://standardebooks.org/opensearch");
const data = await resp.json();