docs: 📝 mention app router is work in progress

Author: HofmannZ

README.md

@@ -38,6 +38,9 @@ same build.
 Our approach is compatible with
 [static site generation][static-generation-link] and supports middleware.
 
+> 🏗️ We are actively working on supporting the new App directory and Server
+> Components released in Next.js 13.
+
 ### Getting started 🚀
 
 1. Add the following lines to your `next.config.js`:

examples/with-app-router/README.md

@@ -1,5 +1,7 @@
 ## Getting Started
 
+> NOTE: This example is a work in progress and is not yet functional.
+
 First, run the development server:
 
 ```bash