Move Rust examples into their crates so cargo publish picks them up

The previous `[[example]] path = "../../examples/rust/..."` entries
pointed at files outside the crate root. cargo only packages files
inside the crate directory, so the examples would have been silently
dropped on publish. Moving them to crates/wickra/examples/ and
crates/wickra-data/examples/ keeps them as part of the published
package and lets cargo discover them automatically (no [[example]]
override needed). README and project-layout section updated.

crates/wickra-data/examples/live_binance.rs

@@ -0,0 +1,41 @@
+//! Connect to Binance, run incremental RSI on the closed kline events.
+//!
+//! Build with:
+//! ```text
+//! cargo run --release --example live_binance --features wickra-data/live-binance -- BTCUSDT
+//! ```
+//!
+//! The example prints a line per bar close. Hit Ctrl+C to stop.
+
+use std::env;
+
+use wickra::{Indicator, Rsi};
+use wickra_data::live::binance::{BinanceKlineStream, Interval};
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args: Vec<String> = env::args().collect();
+    let symbol = args
+        .get(1)
+        .cloned()
+        .unwrap_or_else(|| "BTCUSDT".to_string());
+
+    let mut stream =
+        BinanceKlineStream::connect(std::slice::from_ref(&symbol), Interval::OneMinute).await?;
+    let mut rsi = Rsi::new(14)?;
+    println!("Listening for {symbol} 1m closes…");
+
+    while let Some(event) = stream.next_event().await? {
+        if !event.is_closed {
+            continue;
+        }
+        let close = event.candle.close;
+        let v = rsi.update(close);
+        if let Some(value) = v {
+            println!("{}  close={:.4}  rsi={:.2}", event.symbol, close, value);
+        } else {
+            println!("{}  close={:.4}  rsi=…warmup", event.symbol, close);
+        }
+    }
+    Ok(())
+}