[react] feat: Added docs for components/DiffViewer

sites/dev/docs/reference/packages/react/components/diffviewer/readme.mdx

@@ -2,6 +2,28 @@
 title: DiffViewer
 ---
 
-:::note
-This page is yet to be created
+import { DocusaurusDoc } from '@freesewing/react/components/Docusaurus'
+
+<DocusaurusDoc>
+
+The **DiffViewer** component family provides the following components:
+
+- [DiffViewer](#diffviewer): A re-export of [react-diff-viewer-continued][dv]
+
+In addition, it also exports the following functions:
+
+- [diffJSON](#diffjson): A re-export of the [diffJson][jsd] function of the [jsdiff package][jsd]
+- [diffCheck](#diffcheck): A re-export of the [diffWords][jsd] function of the [jsdiff package][jsd]
+
+:::tip
+#### Not FreeSewing code
+This component family only contains re-exports of code by other maintainers.\
+Since they are a dependency, we provide them as part of the <code>@freesewing/react</code> package for convenience.
+
+Please refer to the documentation for [react-diff-viewer-continued][dv] and [jsdiff][jsd].
 :::
+
+</DocusaurusDoc>
+
+[dv]: https://github.com/aeolun/react-diff-viewer-continued?tab=readme-ov-file#usage
+[jsd]: https://github.com/kpdecker/jsdiff