Add Svelte README

Author: babycourageous

example/svelte/README.md

@@ -0,0 +1,6 @@
+# svelte example
+
+[@babycourageous](https://github.com/babycourageous) has an example of how to use the `netlify-identity-widget` with Svelte.
+
+- [Repo](https://github.com/babycourageous/netlify-identity-demo-svelte)
+- [example website](https://netlify-identity-demo-svelte.netlify.com/)