Add README and instructions

README.md

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+# DOM I
+
+Topics:
+ * Interacting with the DOM
+ * Selectors
+  * selectElementsByClassname
+  * selectElementbyId
+  * querySelector
+  * querySelectorAll
+ * NodeList
+ * HTMLCollection
+
+## Objectives
+ * Manipulate the DOM using JavaScript
+ * Choose selectors for a given problem
+ * Work with the object the different selectors return
+
+## Beginning Project
+ * You'll be working in the `digital_timer` directory
+ * Add your script tag into you index.html
+ * You can open your `index.html` file in your browser to see your work, but you may also work in codepen.io first if you'd like
+ * All your work will be done in `index.js`
+ * Make sure to read both the `index.html` and `styles.css` files so that you know what you're working with
+ * Organization of your code in `index.js` will be up to you. There will be suggestions provided later in the day