add ecomm example idea

examples/README.md

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+
+# Examples
+
+- `multihop` - Simple as possible demonstration of a graph with two partitions alpha and beta, where beta depends on alpha.
+
+## Ideas
+
+### E-Commerce Search Ranker
+- Search to detail page behavior to conversion to return pipeline
+- Add in "profile resolution" step to capture dep type? (e.g. person signs in at checkout)
+- "input" partitioning: date, country (different infra/laws/products/culture), customer? (what if its for shopify)
+- search ranking modeling flow: TDC, train, inference (simple linear model) 
+- cross-customer product fraud alliance to qualify products (excuse to have fan-in-and-out pattern - "opt in")
+- sessionizing/preprocessing impressions
+- returns happen later, and handling them in an atomic, final way
+- performance metrics aggregates
+- what does multiple paths back to the same partition?