[ADD] fsm: add documentation fsm

fsm/customize_worksheets.rst

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+============================
+Customize worksheet reports
+============================
+Personalizing your customer reports, also called *worksheets*, allows you to have different
+descriptions of the work for each type of intervention. It speeds up the flow for your employees
+while giving customers a detailed summary, which can be reviewed and signed onsite.
+
+Enable the feature
+===================
+Go to :menuselection:`Field Service --> Configuration` and enable
+:menuselection:`Worksheet Templates --> Save`.
+
+.. image:: media/cc1.png
+   :align: center
+   :alt: Custom Worksheet in Odoo Field Service
+
+Designing worksheets
+=====================
+Under :menuselection:`Configuration --> Worksheet Templates`, click on *Create* and start to
+*Design Worksheet Template*.
+You will be redirected to the *Studio* application.
+
+.. image:: media/cc2.png
+   :align: center
+   :alt: Custom Worksheet in Odoo Field Service
+
+With the freedom of *Studio*, drag and drop fields to create a report tailored to your needs.
+Once you are done, click on *Close* and get an overview of the work done.
+
+*Worksheets* is where you can see how many times the worksheet has been used/completed under a task.
+*Analysis* examines all the worksheets under that given template and generates a graph.
+
+.. image:: media/cc3.png
+   :align: center
+   :alt: Custom Worksheet in Odoo Field Service
+
+.. seealso::
+   - `Studio Basics <https://www.odoo.com/slides/slide/studio-basics-710?fullscreen=1>`_