Add a Node.js wrapper library

The implementation is very similar to the Python wrapper.

nodejs/__test__/index.spec.mjs

@@ -1,7 +1,25 @@
 import test from 'ava'
 
-import { sum } from '../index.js'
+import { liblootVersion, isCompatible, Group } from '../index.js'
 
-test('sum from native', (t) => {
-  t.is(sum(1, 2), 3)
+test('liblootVersion', t => {
+  t.is(liblootVersion(), "0.26.0")
+});
+
+test('isCompatible', t => {
+  t.is(isCompatible(0, 26, 0), true)
+});
+
+test('Group equality', t => {
+  const group1 = new Group("A");
+  const group2 = new Group("A");
+  const group3 = new Group("B");
+
+  t.deepEqual(group1.name, group2.name);
+  t.notDeepEqual(group1.name, group3.name);
+
+  t.deepEqual(group1, group2);
+
+  // The objects have no public fields so appear to be equal.
+  t.deepEqual(group1, group3);
 })