Create twenty-eggs-protect.md

.changeset/twenty-eggs-protect.md

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+---
+"@xmtp/xmtp-js": major
+---
+
+### BREAKING CHANGES
+
+- Removed internal content types and their primitives
+- Added content types and primitives from their respective packages
+- Removed `ContentTypeComposite`, see [XIP-19](https://community.xmtp.org/t/xip-19-deprecate-the-composite-codec/525) for more details
+- Removed `ContentTypeFallback`
+
+With this update, the following are no longer exported from the JS SDK: `ContentTypeId`, `CodecRegistry`, `ContentCodec`, `EncodedContent`, `ContentTypeFallback`, `TextCodec`, `ContentTypeText`, `Composite`, `CompositeCodec`, `ContentTypeComposite`
+
+For content type primitives, use the new `@xmtp/content-type-primitives` package. It exports `ContentTypeId`, `CodecRegistry`, `ContentCodec`, and `EncodedContent`.
+
+The text content type and codec can now be found at `@xmtp/content-type-text`. It exports `ContentTypeText`, `Encoding`, and `TextCodec`.