Add the Svelte VS Code extension.

Author: Mike Nikles

.gitpod.yml

@@ -1,3 +1,4 @@
+
 tasks:
   - init: npm install
     command: |
@@ -6,4 +7,8 @@ tasks:
 
 ports:
   - port: 3000
-    onOpen: open-browser
+    onOpen: open-browser
+
+vscode:
+  extensions:
+    - svelte.svelte-vscode