Reorg and prep for alpha release (#432)

sprites/README.md

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+<h1 align="center"><img src="https://img.fortawesome.com/349cfdf6/gh-logo.svg" alt="Font Awesome 5" width="50%"></h1>
+
+Our $1,000,000 Kickstarter stretch goal brought our **SVG Framework** to all of
+Font Awesome 5. We are super-excited to bring this to you.
+
+As a Pro backer your early access preview gives you access to this new
+framework and we need your help!
+
+[We're collecting feedback here.](https://github.com/FortAwesome/Font-Awesome-Pro/issues/412)
+
+### SVG Framework using the SVG sprites technique
+
+Pros:
+
+- No JavaScript
+- Super simple
+- Fast!
+
+Cons:
+
+- Cross-origin loading (like a CDN) is pretty tough
+- Doesn't include the CSS framework
+- Not backward compatible (cannot use `<i>`)
+- Takes extra effort to make it accessible
+
+Browser support (tested using BrowserStack):
+
+| On               | Edge   | IE              | Chrome                     | Firefox                    | Safari    | Opera  | Yandex |
+|------------------|--------|-----------------|----------------------------|----------------------------|-----------|--------|--------|
+| Desktop versions | last 2 | no*             | last 2                     | last 2                     | last 2    | last 2 | 14     |
+| Mobile versions  | -      | -               | iOS latest Android 6, 5, 4 | iOS latest Android 6, 5, 4 | iOS 9, 10 | -      | -      |
+
+\* IE will not automatically download SVG documents referenced with `xlink:href`