Added note about what kind of features carson support

Author: Nyholm

README.md

@@ -15,3 +15,13 @@ an issue or pull request and comment to update its status. If Carson does his jo
 well (i.e. if it's useful), more features may be added in the future.
 
 For details on how this review / label process works, see http://symfony.com/doc/current/contributing/community/reviews.html
+
+## Feature scope
+
+Carson is excellent to look at issues and pull request to make sure they are correctly
+labeled, uses a supported branch or to say hi to new contributors. Carson also likes
+cloning a repository and run checks on it time to time, ie making sure all translations
+are up to date.
+
+Carson will never read the contents of a pull requests, ie it never parses the code
+to check for typos or other automated fixes.