[#3280] Added stub Performance page

Performance subpage was missing.  Added with simple content.

diff --git a/doc/devel/performance.dox b/doc/devel/performance.dox
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+// Copyright (C) 2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/**
+
+ @page Performance
+
+This section is for topics pertaining to Kea runtime performance.
+
+*/