create some more compelling examples

packages/signals/examples/context.rs

@@ -0,0 +1,25 @@
+#![allow(non_snake_case)]
+
+use dioxus::prelude::*;
+use dioxus_signals::{use_signal, Effect, Signal};
+
+fn main() {
+    dioxus_desktop::launch(app);
+}
+
+fn app(cx: Scope) -> Element {
+    // Because signal is never read in this component, this component will not rerun when the signal changes
+    use_context_provider(cx, || Signal::new(0));
+
+    render! {
+        Child {}
+    }
+}
+
+fn Child(cx: Scope) -> Element {
+    let signal: Signal<i32> = *use_context(cx).unwrap();
+    // This component does read from the signal, so when the signal changes it will rerun
+    render! {
+        "{signal}"
+    }
+}