docs/howto: Create howto-install-eclipse-capella.md

docs/howto/howto-install-eclipse-capella.md

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+# HOWTO Install Eclipse Capella
+
+## Executive Summary
+
+This document explains how to install [Eclipse Capella™](https://www.eclipse.org/capella/) - an Open Source solution for Model-Based Systems Engineering - and use it for the ARNEIS project.
+
+## Introduction Eclipse Capella™
+
+Eclipse Capella™ is a comprehensive, extensible and field-proven MBSE tool and method
+to successfully design systems architecture.
+
+<https://www.youtube.com/watch?v=WSzlN4YT3gM>
+
+### References
+
+* <https://www.eclipse.org/capella/>
+
+## Step-by-step instructions
+
+Open <https://www.eclipse.org/capella/download.html> and download the version of Capella suitable for your host HW and OS.
+In my case (HW2457) this is "CAPELLA 6.1 FOR WINDOWS 64-BIT".
+
+![image](https://github.com/B-AROL-O/ARNEIS/assets/75182/871df363-b8a1-4247-be3e-1ad9a1774ad6)
+
+You may select another mirror if you like, otherwise click "Download".
+
+![image](https://github.com/B-AROL-O/ARNEIS/assets/75182/7f1ecce0-cb6e-4aa7-9387-0bcb2abe23de)
+
+You may also support the Eclipse Community by donating some money.
+
+TODO
+
+<!-- EOF -->