Add example to "now" function

Closes rdwatters/hugo-docs-concept#63

content/functions/now.md

@@ -19,3 +19,25 @@ needsexamples: true
 ---
 
 `now` returns the current local time as a [`time.Time`](https://godoc.org/time#Time).
+
+For example, building your site on June 24, 2017 with the following templating:
+
+```html
+<div class="copyright">
+    <small>&copy; {{ now.Format "2006"}}</small>
+</div>
+```
+
+Which will produce the following:
+
+```html
+<div class="copyright">
+    <small>&copy; 2017</small>
+</div>
+```
+
+The above example also uses the [`.Format` function](/functions/format), which page includes a full listing of date formatting using Golang's layout string.
+
+{{% note %}}
+Older Hugo themes may use the deprecated `.Now` (uppercase). Be sure to use the lowercase `.now` in your templating.
+{{% /note %}}