add sandbox app

Author: Rich-Harris

content/tutorial/04-advanced-sveltekit/01-todo/01-sandbox/README.md

@@ -0,0 +1,5 @@
+---
+title: Sandbox
+---
+
+ignore me

content/tutorial/04-advanced-sveltekit/01-todo/01-sandbox/app-a/node_modules/cjs-dep/index.js

@@ -0,0 +1,3 @@
+export function foo() {
+	return 42;
+}

content/tutorial/04-advanced-sveltekit/01-todo/01-sandbox/app-a/node_modules/cjs-dep/package.json

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+<h1>sandbox</h1>

content/tutorial/04-advanced-sveltekit/01-todo/01-sandbox/app-a/node_modules/esm-dep/index.js

@@ -0,0 +1,3 @@
+{
+	"title": "TODO"
+}