Shopify Provider (#186)

* Start of Shopify provider

* add missing comment to documentation

* add missing env vars to documentation

* update reference to types file

framework/shopify/api/operations/get-page.ts

@@ -0,0 +1,27 @@
+import { ShopifyConfig, getConfig } from '..'
+import type { Page } from '../../types'
+
+export type { Page }
+
+export type GetPageResult<T extends { page?: any } = { page?: Page }> = T
+
+export type PageVariables = {
+  id: string
+}
+
+async function getPage({
+  url,
+  variables,
+  config,
+  preview,
+}: {
+  url?: string
+  variables: PageVariables
+  config?: ShopifyConfig
+  preview?: boolean
+}): Promise<GetPageResult> {
+  config = getConfig(config)
+  return {}
+}
+
+export default getPage