add admin guide (#9137)

Author: lizokm

docs/product/accounts/getting-started/Admin-quick-reference-guide.pdf

@@ -6,6 +6,8 @@ description: "Learn how to set up a Sentry organization account so you can start
 
 In this guide, we'll provide the recommended checklist for setting up your [Sentry organization account](https://sentry.io) so you can get started with Sentry error monitoring.
 
+If you'd prefer a TL;DR, download our ["Admin Quick Reference Guide"](/pdfs/Admin-quick-reference-guide.pdf)
+
 We understand that some of you are running enterprise organizations, while others of you are hobbyists just coding for fun. Below, we've linked where you should get started, depending on your situation.
 
 - You're configuring Sentry for a large organization? [Start at step 1](#1-enable-single-sign-on-access)