Update README.md

Author: AndrewCraswell

README.md

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-**UPDATE: Microsoft is currently in process of building an official `@azure/msal-react` library which will replace `react-aad-msal`. While this library will remain till then, it is not recommended for new applications since it relies on the older MSAL 1.0 dependencies, which are based on the old authentication flow which has known issues. There will be some intermediary updates to help support a migration path to the official library, but at this point, `react-aad-msal` is scheduled to be deprecated.**
+**DEPRECATION NOTICE: Microsoft has released the official [`@azure/msal-react`](https://www.npmjs.com/package/@azure/msal-react) library which replaces `react-aad-msal`. It is recommended that applications migrate to the officially supported library in order to utilize the better Auth Code Flow process. `react-aad-msal` uses older MSAL dependencies which have known drawbacks for some clients. New applications should not consider using this library, as it will not be maintained. Please review the `@azure/msal-react` official [documentation](https://github.com/AzureAD/microsoft-authentication-library-for-js/tree/dev/lib/msal-react), [samples](https://github.com/AzureAD/microsoft-authentication-library-for-js/tree/dev/lib/msal-react#samples), and [migration guide](https://github.com/AzureAD/microsoft-authentication-library-for-js/blob/dev/lib/msal-react/docs/migration-guide.md) for more information.**
 
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