[enhance] UAE/KSA VAT/Excise implementation (#11923)

erpnext/docs/user/manual/en/regional/united_arab_emirates/index.txt

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+uae-vat-setup

erpnext/docs/user/manual/en/regional/united_arab_emirates/uae-vat-setup.md

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+# VAT/EXCISE Tax Implementation for UAE/KSA
+
+### 1. Setting up Tax Registration No for customer, supplier and company
+
+Set tax registation number in the field tax id for the customer, supplier and company
+
+1. For Customer
+<img class="screenshot" alt="TRN in Customer" src="/docs/assets/img/regional/uae/tax-id-customer.png">
+
+2. For Company
+<img class="screenshot" alt="TRN in Company" src="/docs/assets/img/regional/uae/tax-id-company.png">
+
+### 2. Setting up TAX Code for Products
+Setup tax code in the item master, system will fetch same code in the sales/purchase invoice on selection of an item.
+
+<img class="screenshot" alt="Tax Code in Item" src="/docs/assets/img/regional/uae/tax-code-item.png">
+### 3. Default Tax Templates
+
+ERPNext provides you default tax template for vat(5%, zero, exempted) and excise(50%, 100%). You can create your own [tax template](/docs/user/manual/en/setting-up/setting-up-taxes.html).
+
+<img class="screenshot" alt="Default Tax Template" src="/docs/assets/img/regional/uae/uae-tax-templates.png">
+
+### 3. Making VAT Ready Invoices
+
+If you have setup the TRN of your Customers and Suppliers, and your tax template, you are ready to go for making VAT Ready Invoices!
+
+For **Sales Invoice**,
+
+1. Select the correct Customer and Item and the address where the transaction will happen.
+2. Check if the TRN of your Company and Supplier have been correctly set.
+3. Check if the TAX Code has been set in the Item
+4. Select the  template that you have created based on the type of transaction
+5. Save and Submit the Invoice
+
+<img class="screenshot" alt="VAT Invoice" src="/docs/assets/img/regional/uae/vat-invoice.gif">
+
+### 4. Print Tax Invoice
+
+ERPNext provides 2 default print foramt
+
+1. Simplified Tax Invoice
+<img class="screenshot" alt="Simplified Tax Invoice" src="/docs/assets/img/regional/uae/simplified-invoice.png">
+
+2. Detailed Tax Invoice
+<img class="screenshot" alt="Detailed Tax Invoice" src="/docs/assets/img/regional/uae/detailed-invoice.png">