Update CONTRIBUTING.md

CONTRIBUTING.md

 # Contributing
 
-If you have any issues or ideas for improvement you can send me an email to _thl-cmk[at]outlook[dot]com_.
+If you have any issues or ideas for improvement you can contact me in the [CMK forum](https://forum.checkmk.com/) by sending me a direct message to `@thl-cmk` (this is the prefered way) or send an email to _thl-cmk[at]outlook[dot]com_.
 
-For some fixes/improvements I migth need a _snmpwalk_ from the device in question.
-This must contain
-
-- .1.3.6.1.2.1.1.1 sysDescr 
-- .1.3.6.1.2.1.1.2 sysObjectID
+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)
 
+For SNMP based plugins I migth need a snmpwalk from the device in question. This must contain
+```
+.1.3.6.1.2.1.1.1 sysDescr
+.1.3.6.1.2.1.1.2 sysObjectID
+```
 and all the SNMP OIDs used in the plugin.
-
-If you run the _snmpwalk_ command, please uses these options _**-ObentU**_ in addition to your snmp options like community, version etc.
+If you run the snmpwalk command, please uses these options -ObentU in addition to your snmp options like community, version etc.
 For example:
 ```
 snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.2.1.1.1 > hostname.snmpwalk
 snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.2.1.1.2 >> hostname.snmpwalk
 snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.2.3.2 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.2.3.7 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1.8.1 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1.9.1 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1.10.1 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1.12.1 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1.13.1 >> hostname.snmpwalk
-snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.1.1.18.1 >> hostname.snmpwalk
-
+snmpwalk -v2c -c public -ObentU 10.10.10.10 .1.3.6.1.4.1.15497.1.2.3 >> hostname.snmpwalk
 ```