add 2026 slides

Author: lukemckinstry

DevCon_CesiumJS_DeepDive_2025.pdf

@@ -1,6 +1,6 @@
 # CesiumJS Deep Dive Workshop
 
-Stater code for the CesiumJS Deep Dive Workshop, part of the 2026 Cesium Developer Conference.
+Stater code for the [CesiumJS Deep Dive Workshop [slides]](DevCon_CesiumJS_DeepDive_2026.pdf), part of the 2026 Cesium Developer Conference.
 
 This example repo is designed to get a new developer up and running with a starter [CesiumJS](https://cesium.com/platform/cesiumjs/) app. It's built using Vite and is based on [`cesium-vite-example`](https://github.com/CesiumGS/cesium-vite-example).