Add Mediabunny Codec Registry

docs/codec-registry/overview.md

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+# Mediabunny Codec Registry
+
+The Mediabunny Codec Registry formalizes the precise definitions of all video and audio codecs supported by Mediabunny. More specifically, for any given codec, it describes the format that `EncodedPacket`, `VideoDecoderConfig` and `AudioDecoderConfig` must adhere to. All packets coming out of or going into Mediabunny are expected to adhere to this registry.
+
+The registry is an extension of the [WebCodecs Codec Registry](https://www.w3.org/TR/webcodecs-codec-registry/). Mediabunny's registry matches that of WebCodecs for all codecs supported by both.
+
+## Video codecs
+
+- [AVC (H.264)](./avc)
+- [HEVC (H.265)](./hevc)
+- [VP8](./vp8)
+- [VP9](./vp9)
+- [AV1](./av1)
+
+## Audio codecs
+
+- [AAC](./aac)
+- [Opus](./opus)
+- [MP3](./mp3)
+- [Vorbis](./vorbis)
+- [FLAC](./flac)
+- [AC-3](./ac3)
+- [E-AC-3](./eac3)
+- [Linear PCM](./pcm)
+- [μ-law PCM](./ulaw)
+- [A-law PCM](./alaw)