Add Mediabunny Codec Registry

docs/codec-registry/opus.md

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+<script setup>
+import { VPBadge } from 'vitepress/theme'
+</script>
+
+<VPBadge type="info" text="Audio codec" />
+
+# Opus codec registration
+
+## Description
+
+The Opus audio codec, specified in [RFC 6716](https://www.rfc-editor.org/rfc/rfc6716).
+
+## Codec ID
+
+```ts
+'opus'
+```
+
+## `EncodedPacket` data
+
+The packet's data must be an Opus packet as described in Section 3 of [RFC 6716](https://www.rfc-editor.org/rfc/rfc6716).
+
+## `EncodedPacket` type
+
+The packet's type is always `'key'`.
+
+## `AudioDecoderConfig` codec string
+
+```ts
+'opus'
+```
+
+## `AudioDecoderConfig` description
+
+If present, `description` must be an Identification Header as defined in Section 5.1 of [RFC 7845](https://www.rfc-editor.org/rfc/rfc7845).