Add reorganization notice (#2517)

README.md

@@ -2,6 +2,12 @@
 [![Crowdin](https://d322cqt584bo4o.cloudfront.net/bitwarden-browser/localized.svg)](https://crowdin.com/project/bitwarden-browser)
 [![Join the chat at https://gitter.im/bitwarden/Lobby](https://badges.gitter.im/bitwarden/Lobby.svg)](https://gitter.im/bitwarden/Lobby)
 
+> **Repository Reorganization in Progress**
+>
+> We are currently migrating some projects over to a mono repository. For existing PR's we will be providing documentation on how to move/migrate them. To minimize the overhead we are actively reviewing open PRs. If possible please ensure any pending comments are resolved as soon as possible.
+>
+> New pull requests created during this transition period may not get addressed —if needed, please create a new PR after the reorganization is complete.
+
 # Bitwarden Browser Extension
 
 <a href="https://chrome.google.com/webstore/detail/bitwarden-free-password-m/nngceckbapebfimnlniiiahkandclblb" target="_blank"><img src="https://imgur.com/3C4iKO0.png" width="64" height="64"></a>