[ADD] accouting: How to set tax-included prices

accounting/others/taxes/tax_included.rst

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+==============================
+How to set tax-included prices
+==============================
+
+In most countries, B2C prices are tax-included. To do that in Odoo, check
+*Included in Price* for your sales taxes in
+:menuselection:`Accounting --> Configuration --> Taxes`.
+
+.. image:: media/tax_included.png
+   :align: center
+
+This way the price set on the product form includes the tax. As an example,
+let's say you have a product with a sales tax of 10%. The sales price on
+the product form is $100.
+
+- If the tax is not included in the price, you will get:
+
+  - Price without tax: $100
+
+  - Taxes: $10
+
+  - Total to pay: $110
+
+- If the tax is included in the price
+
+  - Price without tax: 90.91
+
+  - Taxes: $9.09
+
+  - Total to pay: $100
+
+You can rely on following documentation if you need both tax-included (B2C) and
+tax-excluded prices (B2B): :doc:`B2B_B2C`.
+
+Show tax-included prices in eCommerce catalog
+============================================
+
+By default prices displayed in your eCommerce catalog are tax-excluded. To display
+it in tax-included, check *Show line subtotals with taxes included (B2C)* in
+:menuselection:`Sales --> Configuration --> Settings` (Tax Display).
+