add README file

README.md

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 # ICOS Meta OS
+
+This repository contains all the codebase for the ICOS Meta OS organized in Layer and modules. It represents a convenient way to browse the ICOS Meta OS code. The repository uses submodules to point to the actual code repositories for each component.
+
+## ICOS Meta OS Releases
+
+Tags of this repository corresponds to ICOS Releases and gives a snapshot of the versions of all ICOS components included in each ICOS release.
+
+# Legal
+Copyright © 2022-2024 ICOS. All rights reserved.
+
+🇪🇺 This work has received funding from the European Union's HORIZON research and innovation programme under grant agreement No. 101070177.