Create README

Author: Hipska

README.md

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+# Display Management
+
+The module `sv-display-mgmt` is an [iTop](https://www.itophub.io/) extension to add a new object class [Display](#display) to the [End user devices](https://www.itophub.io/wiki/page?id=latest:datamodel:itop-endusers-devices).
+This new class can be used to document monitors, multimedia projectors, TV and smart boards.
+
+## Installation
+
+Place this in the `extensions` folder of your iTop instance and run iTop setup again.
+Be sure to enable the extension during setup.
+
+## Features
+
+### Display
+
+![Display icon](images/display.png) Parent: `PhysicalDevice`
+
+* Size _(Integer)_ Size of the display in inches
+* Type _(ExternalKey)_ [DisplayType](#displaytype)
+
+### DisplayType
+
+Parent: `Typology`