Adding competencies to the handbook

Why is this change being made?

This MR is to add competencies to the handbook.

@dstanley I made this a WIP, can you kindly edit and review and remove the WIP once you are ready to send to Dave and Carol for review? Feel free to really change anything and everything, as I just created a super basic outline.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what