[ADD] inventory: What is a putaway strategy?

https://docs.google.com/document/d/1Mr3mOGzOB2S2HPgdb2MBzLBwq1zbXnk67AibPtKoo_4/edit#heading=h.g56y5t431ctk

inventory/routes/strategies/putaway.rst

@@ -1,3 +1,73 @@
 ===========================
 What is a putaway strategy?
-===========================
+===========================
+
+Overview
+========
+
+A good warehouse implementation takes care that products automatically
+move to their appropriate destination location. Putaway is the process
+of taking products off the receiving shipment and put them into the most
+appropriate location.
+
+If for instance a warehouse contains volatile substances, it is
+important to make sure that certain products are not stored close to
+each other because of a potential chemical reaction.
+
+A putaway strategy follows the same principle as removal strategies but
+affect on the destination location. Put away strategies are defined at
+the location level (unlike removal strategies which are defined at the
+product level).
+
+Configuration
+=============
+
+Go to :menuselection:`Inventory --> Configuration --> Settings` and check option 
+**Manage several location per warehouse & Advance routing of products using
+rules**, then click on **Apply**.
+
+.. image:: media/putaway01.png
+    :align: center
+
+Setting up a strategy
+=====================
+
+Let's take as an example a retail shop where we store vegetables and
+fruits.
+
+We have to store this type of product in different locations to maintain
+product quality.
+
+Suppose there is one warehouse location **WH/Stock** and there is
+sub location **WH/Stock/Vegetables** & **WH/Stock/Fruits**.
+
+You can create a putaway strategy from 
+:menuselection:`Inventory --> Configuration --> Locations`. 
+Open any location where you want to set a putaway strategy,
+click on **Edit** and locate the option **Put Away Strategy**.
+
+.. image:: media/putaway02.png
+    :align: center
+
+Open the roll-down menu and click on **Create and Edit**. This will open a
+form view of put away strategy on which you have to set a name for the
+strategy, and set the method and fixed location for each category.
+
+.. image:: media/putaway03.png
+    :align: center
+
+When you have entered all the necessary information, click on **Save**.
+
+Now, when you will purchase products from those categories, they will
+automatically be transferred to the correct location.
+
+To check current inventory, Go to 
+:menuselection:`Inventory --> Inventory Control --> Current Inventory`
+
+There you can see current inventory by location.
+
+.. image:: media/putaway04.png
+    :align: center
+
+.. seealso::
+    * :doc:`storage`