Add Sponsor Page

[abettermap]

Add a page with information on different sponsorship opportunities (formerly part of #35)

[JordanMajd]

Should have a paragraph which summarizes what we provide in return for sponsorship and how to get in touch.

[davidbhayes]

Closing as misaligned with current priorities. (Our meeting space is covered by the library, and random donation drives have covered most of our on-going operational costs/desires.)