Add skeleton for Release Announcement Page

Author: carltongibson

docs/topics/3.8-announcement.md

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+<style>
+.promo li a {
+    float: left;
+    width: 130px;
+    height: 20px;
+    text-align: center;
+    margin: 10px 30px;
+    padding: 150px 0 0 0;
+    background-position: 0 50%;
+    background-size: 130px auto;
+    background-repeat: no-repeat;
+    font-size: 120%;
+    color: black;
+}
+.promo li {
+    list-style: none;
+}
+</style>
+
+# Django REST framework 3.8
+
+TODO
+
+The 3.8 release ...
+
+---
+
+## Funding
+
+If you use REST framework commercially and would like to see this work continue, we strongly encourage you to invest in its continued development by
+**[signing up for a paid&nbsp;plan][funding]**.
+
+
+*We'd like to say thanks in particular our premium backers, [Rover](http://jobs.rover.com/), [Sentry](https://getsentry.com/welcome/), [Stream](https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf), [Machinalis](https://hello.machinalis.co.uk/), and [Rollbar](https://rollbar.com).*
+
+---
+
+## Boolean Composable Permissions
+
+TODO
+
+---
+
+
+## Namespace Support
+
+TODO
+
+
+---
+
+## Viewset actions
+
+TODO:
+
+---
+
+## Minor fixes and improvements
+
+There are a large number of minor fixes and improvements in this release. See the [release notes](release-notes.md) page for a complete listing.
+
+---
+
+## Deprecations
+
+TODO
+
+---
+
+## What's next
+
+TODO
+
+[funding]: funding.md