WIP: Full doc proposal for Campus VCS Service

Long overdue uploading this, here is the full proposal document Andy, Bryan, and myself worked on since the end of last year. The cost section still needs to be completed, rephrased, or otherwise smoothed out. The hope was to find enough units paying licensing for their version control systems, that it would largely mitigate the cost of an enterprise license, but so far we were only able to find the library spending any money on VCSs. However, if we can't showcase that, I'm unsure of how to approach the cost section, or maybe it should be removed entirely.

Document:

https://gitlab.engr.illinois.edu/git-solutions-committee/git-use-cases/blob/full-doc/Proposals/campus-vcs-service-full-proposal.md