Update README.md

Author: justin808

README.md

@@ -15,6 +15,8 @@ leaving Webpack responsible solely for app-like JavaScript, or it can be used ex
 
 **NOTE:** The master branch now hosts the code for v6.x.x. Please refer to [5-x-stable](https://github.com/rails/webpacker/tree/5-x-stable) branch for 5.x documentation.
 
+Pleaes see the [new rails/webpacker discussion forum](https://discuss.rubyonrails.org/c/webpacker/10) to discuss debugging and troubleshooting tips. Please open issues for bugs and feature requests.
+
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