Create a new snippet with the zebra CSS style (#121)

* Create a new snippet with the zebra CSS style

* Sentence casing for the title

* Updated explanation and description

* Title should match file name

* Description tweak

* Append date

snippets/zebra-striped-list.md

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+### Zebra striped list
+
+Creates a striped list with alternating background colors, which is useful for differentiating siblings that have content spread across a wide row.
+
+#### HTML
+
+```html
+<ul>
+  <li>Item 01</li>
+  <li>Item 02</li>
+  <li>Item 03</li>
+  <li>Item 04</li>
+  <li>Item 05</li>
+</ul>
+```
+
+#### CSS
+
+```css
+li:nth-child(odd) {
+  background-color: #eee;
+}
+```
+
+#### Demo
+
+
+#### Explanation
+
+1. Use the `:nth-child(odd)` or `:nth-child(even)` pseudo-class to apply a different background color to elements that match based on their position in a group of siblings.
+
+Note that you can use it to apply different styles to other HTML elements like div, tr, p, ol, etc.
+
+#### Browser support
+
+<span class="snippet__support-note">✅ No caveats.</span>
+
+https://caniuse.com/#feat=css-sel3
+
+<!-- tags: visual -->
+<!-- date: 2018-10-31 -->