Create documentation for custom cordapp config (If any exists already I can't find any):
Things to be included:
How to name a custom cordapp configuration file/how it will be pickedup
How to access custom cordapp configuration through the code e.g. serviceHub.getAppContext().config.getString...
How to add custom cordapp configuration through deployNodes (see https://github.com/corda/corda/blob/master/samples/bank-of-corda-demo/build.gradle#L63)
Add a section in the upgrade notes about node configuration not being available in cordapps, with a link to the new custom cordapp info above