Add a note about running tests

Junyu0707 · Junyu0707 · commit d8ba86b4d2a9 · 2026-01-16T12:25:18.000-05:00
diff --git a/README.md b/README.md
@@ -108,3 +108,8 @@ On Mac: `brew install npm`
 	```
 	git branch -D js-calculator
 	```
+## Running the calculator
+
+Run the script:
+```bash
+python3 calculator.py
