Add examples (#45)

examples/async.rs

@@ -0,0 +1,21 @@
+use anyhow::Result;
+use backon::ExponentialBuilder;
+use backon::Retryable;
+
+async fn fetch() -> Result<String> {
+    let response = reqwest::get("https://httpbingo.org/unstable?failure_rate=0.7").await?;
+    if !response.status().is_success() {
+        println!("{}", response.status());
+        anyhow::bail!("some kind of error");
+    }
+    let text = response.text().await?;
+    Ok(text)
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let _ = fetch.retry(&ExponentialBuilder::default()).await?;
+    println!("fetch succeeded");
+
+    Ok(())
+}

examples/blocking.rs

@@ -0,0 +1,14 @@
+use anyhow::Result;
+use backon::BlockingRetryable;
+use backon::ExponentialBuilder;
+
+fn fetch() -> Result<String> {
+    Ok("hello, world!".to_string())
+}
+
+fn main() -> Result<()> {
+    let content = fetch.retry(&ExponentialBuilder::default()).call()?;
+    println!("fetch succeeded: {}", content);
+
+    Ok(())
+}