Add archive notice (#534)

README.md

@@ -1,8 +1,6 @@
-> **Repository Reorganization in Progress**
+> **Archived**
 >
-> 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.
+> This repository is archived, please go to https://github.com/bitwarden/clients for future development.
 
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