Add Roundcube Oauth Documentation#889

CodeShellDev wants to merge 1 commit intomailcow:mastermailcow/mailcow-dockerized-docs:masterfrom

CodeShellDev:mailcow-as-oauth-source-for-rcCodeShellDev/mailcow-dockerized-docs:mailcow-as-oauth-source-for-rcCopy head branch name to clipboard