Added two reports examples

examples/reports-multi-threaded/README.md

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+# Reports - Multi-Threaded Scenarios
+
+This example demonstrates report writing for several scenarios running in parallel.

examples/reports-multi-threaded/main.rs

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+use ixa::context::Context;
+use std::thread;
+
+fn main() {
+    let scenarios = vec!["Illinois", "Wisconsin", "Arizona", "California"];
+    let mut handles = vec![];
+
+    for scenario in scenarios {
+        let scenario = scenario.to_string();
+        let handle = thread::spawn(move || {
+            // Replace this with the actual example code, similar to the simple
+            // example in examples/reports/main.rs
+            let mut context = Context::new();
+            println!("Scenario: {}", scenario);
+
+            context.execute();
+        });
+        handles.push(handle);
+    }
+
+    for handle in handles {
+        handle.join().unwrap();
+    }
+}

examples/reports/README.md

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+# Reports - Simple Example
+
+This example demonstrates creating two types of reports (incidence and death),
+and writing the reports from plans.

examples/reports/main.rs

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+fn main() {}
+
+#[cfg(feature = "reports")]
+fn main() {
+    struct Incidence {
+        person_id: u32,
+        t: f64,
+    }
+    struct Death {
+        person_id: u32,
+        t: f64,
+    }
+
+    let mut context = ixa::context::Context::new();
+    context.add_report::<Incidence>("incidence");
+    context.add_report::<Death>("death");
+
+    context.add_plan(1.0, |context| {
+        context.send_report(Incidence {
+            person_id: 1,
+            t: context.get_current_time(),
+        });
+    });
+
+    context.add_plan(2.0, |context| {
+        context.send_report(Death {
+            person_id: 1,
+            t: context.get_current_time(),
+        });
+    });
+
+    context.execute();
+}