Updated installation instructions

README.md

@@ -3,11 +3,29 @@
 Collection of online tools for teaching at CVH.
 
 
-## Docker installation
+## Installation instructions
 
-Example installation process for Ubuntu:
+### Prerequisites
+- Docker-CE
+  - Installation script ('install_docker.sh') is provided for current Ubuntu installations.
+  For other distributions look for installation instructions at [Install Docker Engine](https://docs.docker.com/engine/install/)
+- Docker Compose
+  - Will also be installed with the script for Docker-CE
+  - Else run `sudo curl -L "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose && sudo chmod +x /usr/local/bin/docker-compose`
+- Git
+  - Git is required to clone the related repositories.
+  - Is probably already installed on the system.
 
+### CVH - OLP (Meta repository)
 
+The first thing you need to do, is cloning this repository which you probably already have done.
+This repository provides you with a collection of scripts
+that will install the OLP as you wish.
+
+```sh
+# Clone with
+git clone https://gitlab.cvh-server.de/aco/cvh-olp.git
+```
 
 ## Nice to know