add readme

readme.md

+# IML Checks for Icinga / Nagios
+
+## Introduction
+
+IML - we are the Institute for Medical Education at university in Bern, Switzerland.
+
+We use Icinga graphite module to show performance data. 
+
+The checks are available in a sister repository.
+
+## License
+
+* Licence: GNU GPL 3.0
+* Source:
+  * Graphs (Graphite): https://git-repo.iml.unibe.ch/iml-open-source/icinga-graphite-templates
+  * Checks: https://git-repo.iml.unibe.ch/iml-open-source/icinga-checks
+
+
+## Installation
+
+You need the graphite modul of icingaweb2 that points to a graphite service (Graphite can run on another server than Icinga).
+
+On the Icinga server put the wanted ini into the folder 
+**/etc_incingaweb2/modules/graphite/templates/**
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