[ADD] Inventory: Add scanning RFID tags documentation

closes odoo/documentation#15350

Signed-off-by: Felicia Kuan (feku) <feku@odoo.com>

content/applications/inventory_and_mrp/barcode/operations.rst

@@ -15,3 +15,4 @@ Daily operations
    operations/barcode_nomenclature
    operations/gs1_nomenclature
    operations/gs1_usage
+   operations/scan_rfid

content/applications/inventory_and_mrp/barcode/operations/scan_rfid.rst

@@ -0,0 +1,51 @@
+==========================
+Manage inventory with RFID
+==========================
+
+Managing inventory with an RFID barcode scanner is possible with the **Barcodes** app and a physical
+RFID scanner.
+
+Make sure the RFD40 scanner is paired and connected to the mobile computer or smartphone. Open an
+operation (like a receipt, transfer, delivery order, or manufacturing order), or count inventory
+using the RFID scanner. Scanning an existing operation barcode pulls up the relevant inventory or
+manufacturing documents in Odoo on the mobile device.
+
+Overview of the workflow
+========================
+
+With the RFD40 scanner in hand, open the **Barcode** app on the computer or phone. Open the
+operation record (via the **Barcode** interface or scanning the operation barcode), or open the
+:guilabel:`Inventory count` operation. Scan the RFID barcodes for the product.
+
+.. seealso::
+   :doc:`../setup/operation_types`
+
+To begin managing inventory using RFID tags, open the **Barcode** app on the smart device.
+
+.. _inventory/barcode/rfid_manage:
+
+Manage inventory
+================
+
+From the **Barcode** app, scan the operation barcode or tap the :guilabel:`Operations` button to
+open operations for receipts, internal transfers, delivery orders, or manufacturing orders. If the
+reading device is not connected, Odoo will automatically connect to the device. When the device is
+connected, a toast notification appears on the screen that verifies the connection. Scan the
+products, then validate the scan on the mobile computer or smartphone.
+
+.. image:: scan_rfid/validate-receipt.png
+   :alt: Validate the operation on the mobile device.
+
+.. _inventory/barcode/rfid_count:
+
+Counting inventory
+==================
+
+It is required by many factories and warehouses to keep track of inventory, including regular counts
+of products to ensure all records are correct. To change the amount of a product in stock, or adjust
+inventory, open the :guilabel:`Inventory count` operation. Scan the products to count. If necessary,
+verify the count manually. You can update the count by clicking the :icon:`fa-pencil`
+:guilabel:`(edit)` icon. Click :guilabel:`Apply` to apply the count on the smart device.
+
+.. image:: scan_rfid/apply-count.png
+   :alt: Apply the count on the Inventory Adjustment page.