Added resources for conformation score event (#97)

[ahokkonen]

Proposal for conformation score event.

• one score per trait
• score value can be decimal
• all possible traits (for dairy and dual purpose) combined in one enumeration
• automated/manual scoring methods allowed
• included "device" for referencing device information in case of automated scoring

TODO: examples to be added

Resolves #97

[cookeac]

This looks great. I particularly like that the list of possible traits are combined and species/purpose independent (because the species or purpose will be known from the animal/location). I will merge as is, but we should think about:
a. Whether "trait" might be confusing as there is also a "traitLabel" in the event base class (but I wouldn't suggest a major change, perhaps traitScored....).
b. Have we checked the other species conformation trait types (as per the same ICAR Guidelines document) to ensure we have a complete list (from memory, the cattle ones were effective for all species).

[ahokkonen]

@cookeac

I agree, we can change property name to "traitScored" or "conformationTrait" to avoid confusions.
I'll check traits list for including types for all species described in guidelines.