[ADD] project: How to record time spent?

https://docs.google.com/document/d/1l6LqhlHJASN5aRLv2RVGTqEmtdiyMtFctvE-7FuWfUk/edit#

point_of_sale/advanced/loyalty.rst

@@ -57,12 +57,17 @@ Your new rule is now created and rewards can be added by clicking on
 Three types of reward can be given: 
 
 -   **Resale**: convert your points into money. Set a product that represents the value of 1 point.
+
 .. image:: media/loyalty14.png
     :align: center
+
 -   **Discount**: give a discount for an amount of points. Set a product with a price of ``0 €`` and without any taxes.
+
 .. image:: media/loyalty13.png
     :align: center
+
 -   **Gift**: give a gift for an amount of points
+
 .. image:: media/loyalty07.png
     :align: center
 

project/configuration/time_record.rst

@@ -1,3 +1,58 @@
 =========================
 How to record time spent?
 =========================
+
+Overview
+========
+
+Odoo allows you to record the time spent per employee and per project,
+for simple reports as well as for direct invoicing to the customer.
+
+Configuration
+=============
+
+In order to record the time spent on projects, you must first activate
+the invoicing of timesheets. Into the **Project** application, open
+:menuselection:`Configuration --> Settings`. In the **Timesheets** section 
+of the page, tick **Activate timesheets on issues**.
+
+.. image:: media/time_record01.png
+    :align: center
+
+.. note::
+    Activating the option will install the Sales, Invoicing, 
+    Issue Tracking, Employee and Timesheet apps.
+
+Recording timesheets
+====================
+
+You can record the time spent in projects straight from the projects
+application. You can either record timesheets in a project, or in a
+task.
+
+Recording in a project
+----------------------
+
+In the **Project** application dashboard, open the **More** menu of the 
+project you want to record timesheets for, and click on **Timesheets**.
+
+.. image:: media/time_record02.png
+    :align: center
+
+In the new window, click on **Create** and insert the required details, then
+click on **Save**.
+
+.. image:: media/time_record03.png
+    :align: center
+
+Recording in a task
+-------------------
+
+In the **Project** app, open the project you want to record timesheets for,
+and open the task on which you have been working.
+
+In the task, click on **Edit**, open the **Timesheets** tab and click on **Add
+an item**. Insert the required details, then click on **Save**.
+
+.. image:: media/time_record04.png
+    :align: center