Add contributing information

2019-12-04 17:58:20 +01:00 · 2019-12-04 17:58:20 +01:00 · 34c6bb9673
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@ -0,0 +1,3 @@
+Please read the excellent [GitHub Open Source Guide](https://opensource.guide/how-to-contribute/) on *How to Contribute on Open Source*.
+
+If you have any further questions just [open a new issue](https://github.com/kitodo/kitodo-presentation/issues/new) and we'll be happy to assist!