Add page billing

docs/user-guide/billing.md

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+# Billing (solidtime Cloud)
+
+You can manage your subscription of solidtime Cloud in the Billig dashboard.
+The billing dashboard can be accessed through the "Billing" entry in the left navigation.
+
+<img src="/img/billing/solidtime-billing-access-dashboard.png" width="150" alt="Button in left navigation to access the billing dashboard" />
+
+## Adding a VAT number
+
+After choosing your plan and clicking on "Subscribe" you need to click "Continue".
+
+<img src="/img/billing/solidtime-billing-vat-1.png" width="500"  alt="Step 1 of the checkout process" />
+
+In the next step click on "Add VAT number" before adding your payment information.
+
+<img src="/img/billing/solidtime-billing-vat-2.png" width="500"  alt="Step 2 with Add VAT number link" />
+
+Now you need to enter your VAT number and the address of your business.
+Afterwards scroll down and click on "Add VAT number".
+Now the price should update to the price without VAT.
+
+<img src="/img/billing/solidtime-billing-vat-3.png" width="500" alt="Add VAT number form" />
+
+You can continue the payment process to finalize the purchase of solidtime Cloud.