Added: Shopify GraphQL variations to verify with graphql-java

[gurveenbagga]

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[gurveenbagga]

I've reviewed the SHOPIFY_QUERY_VARIATIONS.md file and found a few inaccuracies relative to the Shopify Admin API spec:

1. In the OrdersMinimal query (lines 7-24), while the structure is valid, it's worth noting that Shopify's PageInfo also provides hasPreviousPage and startCursor for backward pagination, although hasNextPage and endCursor are sufficient for forward-only flows.
2. In Query #10 (OrdersComplexFilter), the orders field does not accept a filter argument of type OrderFilter. In the Shopify Admin API, complex filtering is handled via the query: String argument.

I've verified these points against the latest Shopify Admin API schema.