Initial example of using a counter

bare-metrics-recorder/examples/counter.rs

@@ -0,0 +1,20 @@
+use bare_metrics_recorder::recording::BareMetricsRecorderCore;
+use metrics::{increment_counter, register_counter, Unit};
+use std::fs::File;
+use std::time::Duration;
+
+pub fn main() -> anyhow::Result<()> {
+    let (shard, stopper) =
+        BareMetricsRecorderCore::new(File::create("/tmp/counter-example.baremetrics")?).start()?;
+    shard.install_as_metrics_recorder()?;
+    register_counter!("my_counter", Unit::BitsPerSecond, "Some counter thing :).");
+
+    for _ in 0..300 {
+        increment_counter!("my_counter");
+        std::thread::sleep(Duration::from_secs(1));
+    }
+
+    stopper.stop();
+
+    Ok(())
+}