Create a GitHub.io page for Awsaml

[Opal Mitchell]

We need a landing page for Awsaml that provides a more curated experience than the README of our GitHub project. We can do this with a GitHub.io page. The page should include:

1. Why Awsaml is useful, what it does, and who should use it (see #43)
2. What the latest version is and where Awsaml can be downloaded
3. Links to documentation on configuring Awsaml for administrators