What would be the correct entity-relationship diagram for this CSV file?
I have similar data model. It is not exactly as you expect. But surely it will help you to get start.

From the CSV file, the following columns can be derived:

Key         
Article_Number  
Color_Code  
Description 
Price
Action_Price
Delivery
Category
Size
Color


For the above mentioned table, the following model can be designed. Depends on your exact requirement, you may normalize this model or denormalize.


I hope this answer will help you.