Add an entry in directory for BugChomper.

BUG=None
R=borenet@google.com
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=1239803008

Review URL: https://codereview.chromium.org/1239803008
diff --git a/site/dev/contrib/directory.md b/site/dev/contrib/directory.md
index 27c8d1a..dc3602e 100644
--- a/site/dev/contrib/directory.md
+++ b/site/dev/contrib/directory.md
@@ -29,6 +29,7 @@
     -   [Perf](https://perf.skia.org/) Performance testing.
     -   [Mon](https://mon.skia.org/) Grafana dashboard (requires login).
     -   [Alerts](https://alerts.skia.org/) Monitor testing and bot status.
+    -   [BugChomper] (https://bugchomper.skia.org/) Prioritize bugs quickly.
     -   [Code Review](https://codereview.chromium.org/)
 
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