Add k6 benchmark example.

examples/benchmark/readme.md

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+# Benchmark Example
+
+## Usage
+
+First, ensure you have `k6` installed. Then, start the server:
+
+```bash
+$ falcon serve --bind http://localhost:9292
+```
+
+Then run `k6`:
+
+```bash
+$ k6 run small.js
+```
+## Comparison
+
+You could start the included `config.ru` with other servers and compare.

examples/benchmark/small.js

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+export const options = {
+	stages: [
+		// Warmup: Gradually ramp up:
+		{duration: '10s', target: 64},
+
+		// Main test: Sustained load:
+		{duration: '1m', target: 64},
+	],
+};
+
+import http from 'k6/http';
+import { check, sleep } from 'k6';
+
+export default function () {
+	const res = http.get('http://localhost:9292/small');
+
+	check(res, {
+		'is status 200': (r) => r.status === 200,
+		'response time < 200ms': (r) => r.timings.duration < 200,
+	});
+}