docs: move around examples

packages/html-namespace/README.md

@@ -0,0 +1,22 @@
+# Html (and SVG) Namespace for Dioxus
+
+The Dioxus `rsx!` and `html!` macros can accept any compile-time correct namespace on top of NodeBuilder. This crate provides the HTML (and SVG) namespaces which get imported in the Dioxus prelude.
+
+However, this abstraction enables you to add any namespace of elements, provided they're in scope when rsx! is called. For an example, a UI that is designed for Augmented Reality might use different primitives than HTML:
+
+```rust
+use ar_namespace::*;
+
+rsx! {
+    magic_div {
+        magic_header {}
+        magic_paragraph {
+            on_magic_click: move |event| {
+                //
+            }
+        }
+    }
+}
+```
+
+This is currently a not-very-explored part of Dioxus. However, the namespacing system does make it possible to provide syntax highlighting, documentation, "go to definition" and compile-time correctness, so it's worth having it abstracted.