[16.0][IMP] sale_order_line_menu : improve Readme

sale_order_line_menu/readme/CONTEXT.md

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+Sometimes, for analysis purposes, we need to be able to search across the Sales Order Lines.

sale_order_line_menu/readme/DESCRIPTION.md

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-Adds a menu item and some views to navigate through Sale Order lines.
+This module adds a menu item and some views to navigate through Sales Order Lines.

sale_order_line_menu/readme/USAGE.md

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-Menu option available at Sales \> Orders \> Order Lines.
+As a Sales User, I go to *Sales > Orders*.
+
+I notice the new submenu ***Order Lines***.
+
+![Sales Order Lines Menu](../static/description/sale_order_line_menu.png)
+
+From the available views (List and Pivot), I can search, filter and group the lines according to my needs.
+
+![Sales Order Lines](../static/description/sales_order_lines.png)