Add sample catalog CSV documentation

docs/catalog_sample.csv

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+Catalog Title,SKU,Handle,Option1 Name,Option1 Value,Option2 Name,Option2 Value,Option3 Name,Option3 Value,Fixed Price,Compare At,Published,Quantity Increment,Minimum Order Quantity,Maximum Order Quantity,Quantity Break 1,Price Break 1,Quantity Break 2,Price Break 2,Quantity Break 3,Price Break 3,Quantity Break 4,Price Break 4,Quantity Break 5,Price Break 5,Quantity Break 6,Price Break 6,Quantity Break 7,Price Break 7,Quantity Break 8,Price Break 8,Quantity Break 9,Price Break 9,Quantity Break 10,Price Break 10
+Ottawa Catalog,tshirt-blue-1,example-t-shirt,Color,blue,,,,,25.00,60.00,TRUE,5,50,1000,100,23.50,150,22.00,200,20.50,250,19.00,300,17.50,350,16,400,14.5,450,13.00,500,11.50,550,10.00
+Ottawa Catalog,tshirt-red-1,example-t-shirt,Color,red,,,,,3,3,,,,,,,,,,,,,,,,,,,,,,
+Ottawa Catalog,pants-34w-32l,example-pants,Color,red,Waist,34,Length,32,45.00,75.00,FALSE,1,1,,50,40.00,150,35.00,500,30.00,,,,,,,,,,,
+Vancouver Catalog,sku-only-identifier-1,,,,,,,20.00,30.00,TRUE,,,,,,,,,,,,,,,,,,,,,,
+Montreal Catalog,,handle-only-identifier,Color,green,,,,,,,,,,,,,,,,,,,,,,,,,,,,

docs/catalog_sample.md

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+# Sample Catalog CSV
+
+This CSV captures the product rows shared in the latest request so they can be downloaded or imported without additional formatting work. It mirrors the original column order and leaves unused fields blank to keep column alignment intact.
+
+- **File**: `docs/catalog_sample.csv`
+- **Columns**: catalog title, SKU, handle, up to three option name/value pairs, pricing (fixed price and compare-at), publication flag, ordering constraints, and up to ten quantity/price breaks.
+- **Blank cells**: fields that were unspecified remain empty so downstream tools can decide how to treat missing values.
+
+If you need to tweak any of the values (for example, to adjust quantity break pricing), edit `docs/catalog_sample.csv` directly and keep the header unchanged so columns continue to line up for spreadsheet or import tooling.

docs/index.md

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 - [Projects, Collections and Tasks](projects.md)
 - [Taxes](taxes.md)
 - [Reports](reports.md)
+- [Sample Catalog CSV](catalog_sample.md)
 - [Modules](https://github.com/jbelelieu/atos_modules)
 - [FAQ](faq.md)