updated readme

README.md

@@ -4,7 +4,27 @@ As always, fork and clone this repo. Submit a Pull Request when you are done.
 
 ## Stoplight
 
-Wire up the buttons to the left of the stoplight to toggle the on/off state of each bulb.
+#### Challenge One: Button Click
+
+Wire up the controls to the left of the stoplight so that when a button is clicked, the corresponding bulb will turn on and all others will turn off.
+
+#### Challenge Two: Button Toggle
+
+Alter your event listeners to toggle the on/off state of each bulb. All three bulbs can be on or off from now on.
+
+#### Challenge Three: Group "Hover" Handler
+
+* Keep your existing code, but add new event listeners on each of your buttons that log `"Entered <textContent> button"` when a user mouses over a button.
+
+* Add new event listeners on each of your buttons that log `"Left <textContent> button"` when a user mouses out.
+
+* Add a single event listener on all three buttons as a group. In your group event handler, log the `textContent` of each button when a user clicks the button.
+
+#### Bonus Challenge: On/Off Message
+
+* If the corresponding bulb is off when a user clicks a button, change the log message in your group event listener to say `"<textContent> bulb on"`
+
+* If the corresponding bulb is on when a user clicks a button, change the log message in your group event listener to say `"<textContent> bulb off"`
 
 ![Screenshot of the stop bulb lit up](screenshot.png)
 
@@ -13,3 +33,4 @@ Wire up the buttons to the left of the stoplight to toggle the on/off state of e
 * Retrieve a DOMElement with [`document.querySelector`](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector) or similar method
 * Attach event listeners with [`addEventListener`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
 * Set the color of a bulb with [`background-color`](https://developer.mozilla.org/en-US/docs/Web/CSS/background-color)
+* Explore the various options of [`MouseEvent`](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent)