Add concept for Cocurricular to Learning Method concept scheme

[jared-diener]

We have a use case for publishing cocurricular programs as Learning Opportunities. It would be helpful to add Cocurricular as a concept in the Learning Method concept scheme so they can be more easily identified.

There is ceterms:CocurricularComponent for pathways. We could potentially adapt this definition of Cocurricular.

Resource that identifies an activity, program, or informal learning experience such as a civic or service activity that supplements and complements the curriculum.

CoCurricular is a recognized Achievement Type in OB3.0, so this would help close a gap.