Add AdWords splash page for Balance EBT ads

@lippytak and I are running AdWords ads in California for our "Balance" project — a way to get your food stamp EBT balance via text message:

![screen shot 2014-08-10 at 5 16 29 pm](https://cloud.githubusercontent.com/assets/994938/3872179/55599494-2112-11e4-816a-ea7f4cf64ba8.png)

We're using the codeforamerica.org domain because we need _some_ URL and it seems like a good one to use.

Right now we're just linking to the CFA health page, but we'd like to have a splash page with the phone # to text (we have diff #s for each outreach medium) so that if people _do_ click the ad, they have a clear next step.

This is a total, total v1 MVP of this splash page — if there's a different directory structure or other changes we should make, please let us know. (But I'd really love to not let the perfect be the enemy of the funnel on this one.)

Thanks!