Add file to website "Press Kit" page

Merged monero-project requested to merge xmrhaelan:xmrhaelan-add-quick-fact-sheet into master

Created by: xmrhaelan

This document was created by xmrhaelan, with feedback from community members on IRC, Reddit, and the PR, O&E taiga. xmrhaelan plans to update this document regularly to reflect changes in Monero stats and developments. Please add this to the Press Kit page on getmonero.org

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