move example-projects into examples

examples/hotdog/README.md

@@ -0,0 +1,16 @@
+# Hot diggity dog!
+
+A Dioxus demo app for the new tutorial!
+
+![Demo](assets/screenshot.png)
+
+## To run
+
+Make sure you cd to this directory (dioxus/hotdog) and then `serve` any platform:
+
+```rust
+dx serve --platform web
+dx serve --platform desktop
+dx serve --platform ios
+dx serve --platform android
+```