Add bin using crate croner.

src/bin/using-crate-croner.rs

@@ -0,0 +1,18 @@
+use chrono::Utc;
+use croner::Cron;
+
+fn main() {
+    // Parse a cron expression to find the next occurrence at 00:00 on Friday
+    let cron = Cron::new("0 0 * * FRI")
+        .parse()
+        .expect("Successful parsing");
+
+    // Get the next occurrence from the current time, excluding the current time
+    let next = cron.find_next_occurrence(&Utc::now(), false).unwrap();
+
+    println!(
+        "Pattern \"{}\" will match next at {}",
+        cron.pattern.to_string(),
+        next
+    );
+}