update readme

readme.md

+# IML Checks for Icinga / Nagios
+
+## Introduction
+
+IML - we are the Institute for Medical Education at university in Bern, Switzerland.
+
+This is a collection of our checks. They are used on Linux systems (Debian, CentOS, Ubuntu) and written in Bash using some shared functions.
+
+We use Icinga graphite module to show performance data. The templates are located in a sister repository.
+
+## License
+
+* Licence: GNU GPL 3.0
+* Source: 
+  * Checks: https://git-repo.iml.unibe.ch/iml-open-source/icinga-checks
+  * Graphs (Graphite): https://git-repo.iml.unibe.ch/iml-open-source/icinga-graphite-templates
+
+## Scripts
+
+[inc_pluginfunctions](inc_pluginfunctions.md)
+
+## Checks
+
+...
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