chore: test readme code

Author: slikts

test/readme.test.ts

@@ -0,0 +1,14 @@
+import { Tuple, Tuple0, Tuple1, Tuple2 } from '../src/tuplerone';
+
+// Dummy object
+const o = {};
+describe('readme examples', () => {
+  it('work', () => {
+    expect(Tuple()).toBeInstanceOf(Tuple.constructor);
+    const tuple0: Tuple0 = Tuple(); // 0-tuple
+    const tuple1: Tuple1<typeof o> = Tuple(o); // 1-tuple
+    const tuple2: Tuple2<typeof o, number> = Tuple(o, 1); // 2-tuple
+    // @ts-ignore
+    Tuple(o) === Tuple(o, 1); // TS compile error due to different arities
+  });
+});