Add release note about basic OIDC support. IQSS#6432 IQSS#5974

doc/release-notes/6432-basic-oidc-support.md

@@ -0,0 +1,16 @@
+# Basic OpenID Connect support
+Working on epic #5974 brought us refactored code for our OAuth 2.0 based login options.
+This has now been extended to provide basic support for any OpenID Connect compliant
+authentication provider.
+
+While with our OAuth 2.0 login options you had to implement support for every provider
+by pull request, OpenID Connect provides a standardized way for authentication, user 
+details and more. You are able to use any provider just by loading a configuration file,
+without touching the codebase.
+
+While the usual prominent providers like Google et al feature OIDC support, there are
+plenty of options to easily attach your current user storage to a custom made provider,
+using enterprise grade software. See documentation for more details.
+
+This is to be extended with support for attribute mapping, group syncing and more in
+future versions of the code.