Add note about contributing

readme.md

@@ -6,4 +6,6 @@ The repository is divided by language, currently PHP is the only language with a
 
 Additionally, please contribute any code that you create for specific payment processors. This should be placed in a folder with the processor name, within the relevant language folder. Make sure you don't include any tokens, keys or secrets!
 
-Integration instructions can be found on the Payment API setup page for your event.
+Integration instructions can be found on the Payment API setup page for your event.
+
+To contribute, please contact me for an account in order to be able to create pull requests here.