[ADD] inventory: new V13 doc about "creating transfers from scratch"

inventory/barcode/operations/transfers_scratch.rst

@@ -0,0 +1,17 @@
+==============================
+Create a Transfer from Scratch
+==============================
+
+To create a transfer from the *Barcode* application, you first need to
+print the operation type barcodes. To do so, you can download the
+*Stock barcode sheet* from the home page of the app.
+
+.. image:: media/transfers_scratch_01.png
+    :align: center
+
+Once done, you can scan the one for which you want to create a new
+document. Then, an empty document will be created and you will be able
+to scan your products to populate it.
+
+.. image:: media/transfers_scratch_02.png
+    :align: center