If you're interested in integrating a ton of Android-related features, you can consider this guide I wrote (this is just part 1) of using a JS & Android library I wrote to give WebViews greater features: http://androidtv.news/2015/09/building-android-tv-apps-with-webviews-part-1/

If not, then you can just create a single activity with a webview and then point it to the URL you want.

You can cast any website from a PC. It's more of a temporary solution, but it's incredibly quick and easy.