doc: add readme for hw4

TaiYou-TW · TaiYou-TW · commit 8bdc28f6a70e · 2024-05-29T21:06:16.000+08:00
diff --git a/hw4/README.md b/hw4/README.md
@@ -0,0 +1,15 @@
+# HW4
+
+You can install package through:
+
+```shell
+npm i
+```
+
+After finish your test code in `tests/calculator_test.js`, you can run `Stryker` by:
+
+```shell
+npm run mutate
+```
+
+to get your mutation testing result.
