Create GitLab Engineering Projects handbook section
Initial version of GitLab Engineering Projects section in the handbook, as described in https://gitlab.com/gitlab-com/organization/issues/66#note_26931350.
The purpose of this section of the handbook is to increase visibility of GitLab projects and make it easier to find people who are responsible for scheduling work / allocating resources.
Review at https://handbook-gb-gitlab-projects.about.gitlab.com/handbook/engineering/projects/.