Updated README.md

Author: teocomi

README.md

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 ![image](https://cloud.githubusercontent.com/assets/2679513/16582748/be9e36e4-42a8-11e6-8c0a-429c0caf0ef1.png)
 
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+### Documentation
+More info on custom nodes on the [Dynamo Wiki](https://github.com/DynamoDS/Dynamo/wiki/How-To-Create-Your-Own-Nodes) or [Dynamo Premier](http://dynamoprimer.com/).
 
 ### Debug