docs: Add prelude section for v2.0.0

Call out the two most important features in this release: the REST API
and series/cover letter support.

Signed-off-by: Stephen Finucane <stephen@that.guru>

diff --git a/releasenotes/notes/prelude-2_0-3d2364d246835503.yaml b/releasenotes/notes/prelude-2_0-3d2364d246835503.yaml
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index 0000000..31bfce4
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+++ b/releasenotes/notes/prelude-2_0-3d2364d246835503.yaml
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+---
+prelude:
+  - |
+    The v2.0.0 release includes many new features and bug fixes. For full
+    information on the options avaiable, you should look at the full release
+    notes in detail. However, there are two key features that make v2.0.0 a
+    worthwhile upgrade:
+
+    - A REST API is now provided, which will eventually replace the legacy
+      XML-RPC API
+    - Patch series and series cover letters are now supported
+
+    For further information on these features and the other changes in this
+    release, review the full release notes.