Coding new resources: a few questions

1) Look at the Record Label mod by SamBC (part of the G&K Frankenstein group) which adds Pop Music as a resource, IIRC that didn't have any associated map artwork

2) FLAVOR_RELIGION is certainly allowable (as it's an existing flavour type) ... whether the AI will take any notice of it is a different matter!

Edit: resource flavour is modified by leader flavour, so Isabella (religion=8) is more likely to acquire/improve a resource with a high religion flavour than Shaka (religion=3). However, this is a very small component of the scoring system (proximity, terrain, yields, etc) so probably will have zero noticeable effect in an actual game