Create 10.2 Demonstrate ability to customize customer functionality.md

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Author: ralbin

10. Customer Management/10.2 Demonstrate ability to customize customer functionality.md

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+## 10.2 Demonstrate ability to customize customer functionality
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+Describe how to add or modify customer attributes.
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+Describe how to extend the customer entity. 
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+*How would you extend the customer entity using the extension attributes mechanism?*
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+Describe how to customize the customer address. 
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+*How would you add another field into the customer address?*
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+Describe customer groups and their role in different business processes. 
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+*What is the role of customer groups?*
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+*What functionality do they affect?*
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+Describe Magento functionality related to VAT. 
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+*How do you customize VAT functionality?*