add to contributors

Author: dccowan

notebooks/contributing_index.md

@@ -12,9 +12,9 @@ Some of the things we would like to avoid are:
 
 * tutorials created for the purpose of self promotion
 * tutorials that focuss primarily on functionality that is not part of SimPEG
-* tutorials containing data-specific results, where choices in parameter values are not generally applicable
+* tutorials with a very narrow focus and/or application
 
-For those interested in contributing to SimPEG User Tutorials, please follow the instructions provided.
+If you aren't sure if your tutorial will be a good fit, please [start an issue](https://github.com/simpeg/user-tutorials/issues/new) so we can discuss it. For those interested in contributing to SimPEG User Tutorials, please follow the instructions provided.
 
 
 Steps for Adding a Tutorial