Update CONTRIBUTING.md

CONTRIBUTING.md

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 If you have any issues or ideas for improvement you can send me an email to _thl-cmk[at]outlook[dot]com_.\
 You can also contact me in the [CMK forum](https://forum.checkmk.com/) by sending me a direct message or using `@thl-cmk` in your post.
+
+
+Please include:
+- your CMK version/edition
+- your environment (stand alone or distributed)
+- the OS of your CMK server(s)
+- the version of the plugin
+- the crash report (if any)
+- the output of the nvdct (including the complete command line)
+- the coniguration file of nvdct (by default nvdct.toml)
+
+For issues with the inventory plugins see the contribution guide lines of the inventory plugin.
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