Add Mediabunny Codec Registry

docs/codec-registry/ulaw.md

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+<script setup>
+import { VPBadge } from 'vitepress/theme'
+</script>
+
+<VPBadge type="info" text="Audio codec" />
+
+# μ-law PCM codec registration
+
+## Description
+
+The μ-law companded PCM audio codec, specified in [ITU-T G.711](https://www.itu.int/rec/T-REC-G.711) Tables 2a and 2b.
+
+## Codec ID
+
+```ts
+'ulaw'
+```
+
+## `EncodedPacket` data
+
+The packet's data must be a sequence of bytes of arbitrary length (divisible by the channel count), where each byte is a μ-law encoded PCM sample. For multichannel audio, samples from different channels are interleaved.
+
+## `EncodedPacket` type
+
+The packet's type is always `'key'`.
+
+## `AudioDecoderConfig` codec string
+
+```ts
+'ulaw'
+```
+
+## `AudioDecoderConfig` description
+
+`description` is not used for this codec.