Update README.md

Update to current Thelia 2 tools.
Merge pull request #8 from roadster31/sales

Added the sales related tables.
Merge pull request #4 from lovenunu/patch-1

Update README.md
Add imports / export in model
	modifié:         schema.xml
	modifié:         thelia2_model.mwb
	modifié:         thelia2_model.png
Remove namespace
	modifié:         schema.xml
	modifié:         thelia2_model.mwb
Remove Add AI to PK
	modifié:         schema.xml
	modifié:         thelia2_model.mwb
Merge pull request #9 from lovenunu/export

Add imports / export in model
Add vendor
	modifié:         schema.xml
	modifié:         thelia2_model.mwb
Merge pull request #10 from lovenunu/export

Add vendor
fk_sale_product_attribute_av_id is no longer identifying