update readme

README.md

@@ -1,4 +1,9 @@
-# Welcome to running Leptos CSR (client-side rendered) Apps on Spin!
+<picture>
+    <source srcset="https://raw.githubusercontent.com/leptos-rs/leptos/main/docs/logos/Leptos_logo_Solid_White.svg" media="(prefers-color-scheme: dark)">
+    <img src="https://raw.githubusercontent.com/leptos-rs/leptos/main/docs/logos/Leptos_logo_RGB.svg" alt="Leptos Logo">
+</picture>
+
+# Deploy Leptos CSR on Spin
 
 After installing both the Spin framework and Leptos, then clone this repo and run `trunk watch` in one terminal while also running `spin watch` in another terminal -- when making changes in your Leptos app, the only thing you need to do is reload the browser window: Leptos and Spin will take care of the rest!