added readme to html-css example dir

week2/02-html-css/README.md

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+## HTML and CSS Examples
+
+* _basic.html_ Skeleton HTML page. Handy to use as a template when you start a new page.
+
+* _index.html_ Simple HTML page with a few tags, including a link (`<a>`) tag.
+
+* _html-css-embedded.html_ The CSS is in the HTML file itself, within the `<style>` tag. Examples of using lists, divs, and images. Styling backgrounds, borders, and links, and a simple float example.
+
+* _layout-css-linked.html_ The CSS is pulled in from an external file, _style.css_ in the _css_ folder. Example of CSS layout techniques. Page with header, navigation tabs, and left sidebar.