[ADD] fsm: add documentation fsm

fsm/onsite_tasks_from_sales_orders.rst

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+=====================================================
+Create onsite interventions tasks from Sales Orders
+=====================================================
+By allowing your sales team to open onsite interventions tasks will create a seamless experience
+for your customers. It also allows them to first receive a quotation with the materials that will
+be used plus the service price to be approved before the work even starts.
+
+Enable the feature
+===================
+Go to :menuselection:`Sales --> Products --> Create` or edit an existing one.
+Select: under :menuselection:`General Information --> Product Type: Service`;
+under :menuselection:`Sales --> Service Invoicing Policy: Timesheet on task --> Service Tracking:
+Create a task in an existing project --> Project --> Worksheet Template --> Save`.
+
+.. image:: media/onsite1.png
+   :align: center
+   :alt: Onsite Interventions from Sales Order in Odoo Field Service
+
+Now, once you have *Confirmed* a *quotation*, a task will be created in the respective
+project you have chosen.
+
+.. image:: media/onsite2.png
+   :align: center
+   :alt: Onsite Interventions from Sales Order in Odoo Field Service
+
+
+.. tip::
+   One of the greatest benefits here is that you can have different *Worksheets Templates* under the
+   same project and product, for example.