Installation.md

+The TDL tools are available as a set of Eclipse plug-ins. You need to first be able to run Eclipse. The [Eclipse Modeling Tools](https://www.eclipse.org/downloads/packages/release/2020-06/r/eclipse-modeling-tools) distribution contains most of the necessary prerequisites for the TDL tools.
+
+Once Eclipse is up and running, you need to add the [update site](https://tdl.etsi.org/eclipse/latest/) for the TDL tools: 
+
+    https://tdl.etsi.org/eclipse/latest/
+
+After the update site is added, the list of plug-ins and features shall be shown in the installation dialog (menu item Help->Install New Software..). Select the desired features and proceed with the installation, which will require Eclipse to be restarted once the installation is finished.
+
+To add the new repository to Eclipse, follow these steps:
+
+1. Open the menu item *Help* and select the item *Install new software*
+1. Click *Add...* button to add a new repository
+1. Insert the required information:
+1.1. Name: TOP Plugins
+1.1. Location: https://tdl.etsi.org/eclipse/latest/
+1. Click Ok. In the window, a new set of plugins called TDL should appear
+1. Click on the checkbox to select all the plugins, then click *Next*.
+1. Now follow the instructions to complete the installation
+
+After the installation Eclipse will need to be restarted.
+
+Next step: [Usage of the installed plugins.](Usage)