Add a page for the AVIF integration library (bumptech#4735)

The AVIF integration library was added to Glide in
bumptech#4734.

_pages/avif.md

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+../_posts/2022-01-26-avif.md

_posts/2022-01-26-avif.md

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+---
+layout: page
+title: "AVIF"
+category: int
+date: 2022-01-26 09:38:00
+order: 6
+disqus: 1
+---
+
+### AVIF
+
+[AVIF](https://developer.android.com/about/versions/12/features#avif) is a royalty free image format developed by the [Alliance for Open Media](http://aomedia.org). It is based on the [AV1](https://en.wikipedia.org/wiki/AV1) video codec. AVIF Integration for Glide uses a bundled [AVIF decoder](https://github.com/AOMediaCodec/libavif) to decode and render AVIF images.
+
+The AVIF Integration supports still AVIF images of all bitdepths (8, 10 or 12) and all YUV configurations (420, 422, 444 or monochrome). It does not support animated AVIF images.
+
+
+#### How do I include the AVIF integration library?
+First make sure you've followed the [setup instructions][2] for Applications.
+
+Then add a Gradle dependency on the AVIF integration library:
+
+```groovy
+compile "com.github.bumptech.glide:avif-integration:4.13.0"
+```
+
+Adding a Gradle dependency on the AVIF integration library will cause Glide to start automatically using the bundled AVIF decoder for decoding and rendering AVIF images.
+
+For more details on the automatic registration of integration libraries and answers to common questions, see the [About section][1] for integration libraries.
+
+[1]: {{ site.baseurl }}/int/about.html
+[2]: {{ site.baseurl }}/doc/configuration.html#applications