Add Tabs

[haoxins]

No description provided.

[phated]

I think this should be broken out into separate components that can be composed, e.g. TabContainer, Tab and Panel (or some variation on those names).

<TabContainer>
  <Tab>Something</Tab>
  <Panel>Content</Panel>
</TabContainer>

I'm not sure the best way to tie <Tab> and <Panel> together. Maybe an id and for?