Add docs for with-react

docs/Summary.md

@@ -54,6 +54,7 @@
 ## Libraries
 
 - [Slate React](libraries/slate-react/README.md)
+  - [withReact](libraries/slate-react/with-react.md)
 - [Slate History](libraries/slate-history/README.md)
   - [withHistory](/libraries/slate-history/with-history.md)
   - [HistoryEditor](/libraries/slate-history/history-editor.md)

docs/libraries/slate-react/README.md

@@ -2,6 +2,8 @@
 
 This sub-library contains the React-specific logic for Slate.
 
+- [withReact](./with-react.md)
+
 ## Components
 
 React components for rendering Slate editors

docs/libraries/slate-react/with-react.md

@@ -0,0 +1,17 @@
+# withReact
+
+The `withReact` plugin enables Slate to work in a React environment. Currently, React is the only first class implementation of Slate available.
+
+### `withReact<T extends Editor>(editor: T, clipboardFormatKey = 'x-slate-fragment'): T & ReactEditor`
+
+Add `ReactEditor` to an instance of any `Editor`.
+
+The `clipboardFormatKey` option allows you to customize the `DataTransfer` type when Slate data is copied to the clipboard. By default, it is `application/x-slate-fragment` but it can be customized using this option.
+
+This can be useful when a user copies from one Slate editor to a differently configured Slate editor. This could cause nodes to be inserted which are not correctly typed for the receiving editor, corrupting the document. By customizing the `clipboardFormatKey` one can ensure that the raw JSON data isn't cpied between editors with different schemas.
+
+Example with `withHistory`:
+
+```typescript
+const [editor] = useState(() => withReact(withHistory(createEditor())))
+```