chore: add examples to readme

Author: kormide

README.md

@@ -2,6 +2,58 @@
 
 A Rust crate for capturing application log output for integration testing.
 
-Crate: https://crates.io/crates/logcap
+The logger can have a _threaded_ scope to capture logs from a thread, or with a _process_ scope to capture across all threads.
 
-Docs: https://docs.rs/logcap/latest/logcap
+See the [documentation](https://docs.rs/logcap/latest/logcap).
+
+## Examples
+
+### Capture logs within a single thread
+
+```rust
+use logcap::CaptureScope;
+use log::{info,LevelFilter};
+
+#[test]
+fn test_logs() {
+    logcap::setup();
+
+    // test logic outputting logs
+    info!("foobar");
+
+    // make assertions on logs
+    logcap::consume(|logs| {
+        assert_eq!(1, logs.len());
+        assert_eq!("foobar", logs[0].body);
+    });
+}
+```
+
+### Capture logs across threads
+Run tests with `--test_threads=1` to avoid clobbering logs between tests, or use a mutex for synchronization.
+
+```rust
+use logcap::CaptureScope;
+use log::{LevelFilter,warn};
+
+#[test]
+fn test_logs() {
+    logcap::builder()
+        .scope(CaptureScope::Process)
+        .max_level(LevelFilter::Trace)
+        .setup();
+
+    // test multi-threaded logic outputting logs
+    warn!("warning from main thread");
+    let _ = thread::spawn(|| warn!("warning from thread 1")).join();
+    let _ = thread::spawn(|| warn!("warning from thread 2")).join();
+
+    // make assertions on logs
+    logcap::consume(|logs| {
+        assert_eq!(3, logs.len());
+        assert!(logs.iter.find(|log| log.body.contains("thread 1")).is_some());
+        assert!(logs.iter.find(|log| log.body.contains("thread 2")).is_some());
+        assert!(logs.iter.find(|log| log.body.contains("main thread")).is_some());
+    });
+}
+```