Adding overview of what we did in week3

Author: sdoran

week3/README.md

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+# Week 3 November 22nd
+This week we focused on a couple of new concepts.
+
+1. Style Class
+	- We added a style class to our paragraph html tags called `whiteBg`
+	- Then we added that style class to our *style.css* file and learned that `class` in HTML is `.` in css.
+2. We learned out to center a container on the page
+	- We added `margin-left: auto; margin-right: auto` to our `div#container` (our div with id of container).
+	- We set the width of the container to a percentage (we can't center something taking up the whole screen can we?!)
+3. We changed the background of the entire page to an image
+	- We modified our `body {}` style to use `background-image: url('coder.png');`
+	- We added *background-repeat* and experimented setting it to *no-repeat*, *repeat-x* or *repeat-y*.