Add workload on CourseInstance

Hello all, there is a suggestion in the schema.org GitHub issue tracker 
to add a property for workload 
<https://github.com/schemaorg/schemaorg/issues/1909> [1] to the 
CourseInstance <https://schema.org/CourseInstance> [2] type that came 
from this Community Group.

That seems like a useful addition to me, something like:

courseWorkLoad (Text): the typical effort expected from a student. May 
be expressed per week or month or other time period. May be broken down 
into different activities.

example: "2 hours of lectures, 1 hour of lab work and 3 hours of 
independent study time per week."

I'm open to adding this property to Course as well as CourseInstance, 
but maybe we don't need it as well as typicalLearningTime.

Anyway, feel free to add comments to the GitHub issue or here if you're 
not on GitHub.

Phil


1. https://github.com/schemaorg/schemaorg/issues/1909

2. https://schema.org/CourseInstance

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Phil Barker <http://people.pjjk.net/phil>. http://people.pjjk.net/phil
PJJK Limited <https://www.pjjk.co.uk>: technology to enhance learning; 
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