document strategy roles for recruitment

[bobheadxi]

Do the same for Strategy, that has been done for Developer and Design roles this year

For example, for developers we have:

• role: https://docs.ubclaunchpad.com/handbook/recruitment/developer
• goals: https://docs.ubclaunchpad.com/handbook/recruitment/overview#technical-roles
• interviews: https://github.com/ubclaunchpad/leads/blob/master/interviews/technical.md

[bobheadxi]

https://sourcegraph.com/search?q=repo:%5Egithub%5C.com/ubclaunchpad/docs%24+TODO.*%23189.*%5C%29&patternType=regexp