add svelte app.

webapp/src/ambient.d.ts

@@ -0,0 +1,39 @@
+/**
+ * These declarations tell TypeScript that we allow import of images, e.g.
+ * ```
+		<script lang='ts'>
+			import successkid from 'images/successkid.jpg';
+		</script>
+
+		<img src="{successkid}">
+	 ```
+ */
+declare module "*.gif" {
+	const value: string;
+	export = value;
+}
+
+declare module "*.jpg" {
+	const value: string;
+	export = value;
+}
+
+declare module "*.jpeg" {
+	const value: string;
+	export = value;
+}
+
+declare module "*.png" {
+	const value: string;
+	export = value;
+}
+
+declare module "*.svg" {
+	const value: string;
+	export = value;
+}
+
+declare module "*.webp" {
+	const value: string;
+	export = value;
+}