add a little benchmark script

benchmark.js

@@ -0,0 +1,54 @@
+const { Encoder, Decoder, Tracker } = require('.');
+
+const testSizes = [1, 10, 100];
+
+const encoder = new Encoder('test encoder', 2, 3);
+
+function getNTrackers(n) {
+  const trackers = [];
+  for (let index = 0; index < n; index += 1) {
+    const tracker = new Tracker(index, `Tracker ${index}`);
+    tracker.setPos(0, 0, 0);
+    tracker.setSpeed(0, 0, 0);
+    tracker.setOri(0, 0, 0);
+    tracker.setAccel(0, 0, 0);
+    tracker.setTrgtPos(0, 0, 0);
+    tracker.setStatus(1.0);
+    tracker.setTimestamp(Date.now());
+    trackers.push(tracker);
+  }
+  return trackers;
+}
+
+// TODO(jwetzell): add decode
+function benchmark(trackerCount, iterations) {
+  const benchmarkResults = {
+    encode: {},
+  };
+  const trackers = getNTrackers(trackerCount);
+
+  const dataEncoderStart = performance.now();
+  for (let index = 0; index < iterations; index += 1) {
+    encoder.getDataPackets(Date.now(), trackers);
+  }
+  benchmarkResults.encode.data = performance.now() - dataEncoderStart;
+
+  const infoEncoderStart = performance.now();
+
+  for (let index = 0; index < iterations; index += 1) {
+    encoder.getInfoPackets(Date.now(), trackers);
+  }
+  benchmarkResults.encode.info = performance.now() - infoEncoderStart;
+  console.log(
+    `encoding ${trackers.length} tracker${trackers.length > 1 ? 's' : ''} ${iterations} time${
+      iterations > 1 ? 's' : ''
+    }`
+  );
+  console.table(benchmarkResults);
+}
+
+testSizes.forEach((iterations) => {
+  testSizes.forEach((trackerCount) => {
+    benchmark(trackerCount, iterations);
+  });
+});