Add a README.md

Author: ocaisa

README.md

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+# EESSI Tutorial
+
+This tutorial introduces the **European Environment for Scientific Software Installations (EESSI)** and shows how to 
+access and use scientific software through a shared, portable software stack.
+
+A rendered version of this tutorial is available at <https://ocaisa.github.io/eessi-tutorial/>
+
+## Prerequisites
+
+- Access to a Linux system
+- Basic command-line knowledge
+
+## Contents
+
+- What is EESSI?
+- Accessing EESSI
+- Running software from EESSI
+- Exploring available applications
+- Use cases such as
+  - EESSI as a base
+  - EESSI in CI
+  - Customising EESSI for a specific system (e.g., MPI, GPUs,...)