add link to github issues

docs/contributing/index.md

@@ -2,6 +2,10 @@
 
 This repository contains lists of training materials. It is extensible using github pull requests. You find a how-to guide on the bottom of this page. The format for entries in the repository is documented on the next page.
 
+# Quick contributing short-cut:
+
+If you're too busy to enter everything in detail yourself, please just create a [github issue](https://github.com/NFDI4BIOIMAGE/training/issues) with a link to the materials you want to include in our list. We can take of all the details.
+
 ## What to contribute
 
 Consider adding your favorite training materials and resources. In case you know a collection of resources add it but do not add all individual entries of the collection. We [will be working on collecting them automatically](https://github.com/NFDI4BIOIMAGE/training/issues/2). However, if there are specific entries in such a collection you think are in particlar valuable, feel free to add them now.