Added about page

Change-Id: I847a0022a12a060840f77d171394a21be40ea035

about.md

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+This site aims to be a reference repository about 0-day exploits that are
+actively used in-the-wild. Since mid-2019, Project Zero has dedicated an effort
+specifically to track, analyze, and learn from 0-days that are actively
+exploited in-the-wild. Since 2014, Project Zero's mission has been to "make
+0-day hard." From that came the goal of our in-the-wild program: "Learn from
+0-days exploited in-the-wild in order to make 0-day hard."
+
+One of the key aspects of our work has been to perform and publish root cause
+analyses on each 0-day detected in-the-wild. For the last year, they have been
+published on the [Google Project Zero
+blog](googleprojectzero.blogspot.com/p/rca.html), but we found that we wanted a
+platform that better supports collaboration, history tracking, and updating. So
+we've migrated here!
+
+The goal is for this to be a database of information about exploited 0-days. We
+invite pull requests for both new RCAs and updates/edits to existing ones.
+Please check out the [Contributing page](contributing.html) for more info.