add multiple variants faq entry

faq/multiple-product-variants.md

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+---
+nav_order: 200
+parent: FAQ
+---
+
+# Is it possible for my customers to add multiple product variants (i.e. sizes) at once?
+
+In some cases you m ay want to offer your customers to add multiple product variants at once.
+For example, if you sell T-Shirts in different sizes (S, M, L) your customers might want to create
+one single design and add the T-Shirt with several sizes into the cart (for example 3x S, 4x M, 2x L).
+
+Unfortunately this is not the scope of the product designer's implementation, so you have to install another plugin
+for that kind of functionality.
+
+If you use Shopware, we strongly recommend _Variants table_ (in German: _Varianten als Tabelle_). It's
+a great plugin which got tested carefully together with the Product Designer.
+
+You can find a demo here:
+https://shopware6.cilb.de/T-Shirt/T-SHIRT
+