Add Mediabunny Codec Registry

docs/codec-registry/av1.md

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+<script setup>
+import { VPBadge } from 'vitepress/theme'
+</script>
+
+<VPBadge type="info" text="Video codec" />
+
+# AV1 codec registration
+
+## Description
+
+The AOMedia Video 1 (AV1) video codec, specified in the [AV1 Bitstream & Decoding Process Specification](https://aomediacodec.github.io/av1-spec/).
+
+## Codec ID
+
+```ts
+'av1'
+```
+
+## `EncodedPacket` data
+
+The packet's data must comply with the low-overhead bitstream format as defined in Section 5 of the [AV1 Bitstream & Decoding Process Specification](https://aomediacodec.github.io/av1-spec/).
+
+## `EncodedPacket` type
+
+If the packet's type is `'key'`, then the packet is expected to contain a frame with `frame_type` of `KEY_FRAME`, as defined in Section 6.8.2 of the [AV1 Bitstream & Decoding Process Specification](https://aomediacodec.github.io/av1-spec/).
+
+## `VideoDecoderConfig` codec string
+
+The full codec string begins with the prefix `'av01.'`, with a variable-length suffix as specified in Section 5 of the [AV1 Codec ISO Media File Format Binding](https://aomediacodec.github.io/av1-isobmff/).
+
+## `VideoDecoderConfig` description
+
+`description` is not used for this codec.