Add initial taxation documentation for end users

guides/source/users/settings/overview.html.md

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+# Overview
+
+<!-- TODO:
+  General settings overview.
+-->
+
+## Taxes
+
+With Solidus, you can create tax rates and tax categories that correspond with
+each item in your store and each location that you ship to. 

guides/source/users/settings/taxes.html.md

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+# Taxes
+
+When you go to the **Settings -> Taxes** page of the Solidus admin interface,
+you can set up [tax categories](#tax-categories) and [tax rates](#tax-rates)
+that help you tax customers according to the taxation laws in your region(s).
+
+*Before you set up taxes in your store, you should set up [zones][zones], which
+are locations that your store manages regarding shipping and taxes.*
+
+## Tax categories
+
+Each of your [products][products] has a **Tax Category** field. This allows you
+to charge different tax rates for products, which you may need to do in order to
+comply with your regional laws.
+
+For example, if you have a stock location in California, any clothing you ship
+within the state should be taxed. But any candy that you sell is tax exempt. You
+may want to create a "Candy" tax category to handle your candy products that are
+exempt from tax.
+
+[products]: ../products/overview.html
+
+### Tax category fields
+
+When you create or edit a tax category, it uses the following settings:
+
+- **Name**: The name for your tax category. 
+- **Tax Code**: An optional tax code that describes your tax category.
+- **Default**: A checkbox that sets whether the current tax category should be
+  used as the default tax category for new products.
+- **Description**: An optional long description for your tax category.
+
+## Tax rates
+
+You can create tax rates that should be used for orders from [different states
+or countries][zones], as well as for each of your tax categories. If your stores
+have more complicated tax requirements, your tax rates can perform more complex
+functions:
+
+- You can create tax rates that calculate using sales tax (U.S.-style taxes) or
+  value-added taxes ([VAT][vat], or E.U.-style taxes). Sales tax is applied on
+  top of the price of each item, where as VAT is included in the price of each
+  item.
+- You can show or hide tax rates in customer invoices.
+- You can create tax rates that are valid from a specific date.
+- You can change the **Base Calculator** to [a custom tax
+    calculator](#tax-calculators).
+
+[vat]: https://en.wikipedia.org/wiki/Value-added_tax
+[zones]: zones.html
+
+### Create a tax rate
+
+You can create a new tax rate in just a few steps:
+
+1. Go to the **Settings -> Taxes** page of the Solidus admin interface.
+2. Go to the **Tax Rates** page.
+3. Select the **New Tax Rate** button.
+4. Fill in the information for your new tax rate. See [Tax rate
+   fields](#tax-rate-fields) for more information.
+5. Select the **Create** button to save the new tax rate.
+
+### Tax rate fields
+
+When you add or edit a tax rate, the following settings are available:
+
+- **Name**: The name for the tax rate. By default, customers can see the name of
+    the tax rate during checkout.
+- **Rate**: The tax rate as a decimal. For example, `0.05` would become a 5% tax
+    rate.
+- **Included in Price**: Sets whether the tax should be calculated as already
+    included in price of items ([value-added tax][vat]) or should be calculated
+    as sales tax on top of the price of items.
+- **Zone**: The [zone][zones] where this tax rate applies.
+- **Tax Category**: The [tax category](#tax-categories) that this tax rate
+    should apply to.
+- **Validity Period**: The start and end dates that this tax rate is valid to.
+- **Base Calculator**: The tax calculator that should be used to calculate
+    taxes. For more information, see [Tax calculators](#tax-calculators) below.
+
+## Tax calculators
+
+By default, Solidus includes a single tax calculator called **Default Tax**.
+This calculator is suitable to calculate taxes for typical ecommerce
+transactions around the world.
+
+If your business has complicated tax requirements, you may want to have your
+development team create a tax calculator that is suited specifically to your
+store.

guides/source/users/settings/zones.html.md

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+# Zones
+
+Solidus manages locations using a concept called **Zones**.