progress docs

pages/_docs/progress.md

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+---
+title: Progress
+description: A progress bar can be used to show a user how far along he is in a process.
+---
+
+### Default markup
+
+To create a default progress bar, add a `.progress` class to a `<div>` element:
+
+{% example html %}
+{% include ui/progress.html %}
+{% endexample %}