Create sso.md

Author: MinecollYT

docs/docs/sso.md

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+# Setting up SSO
+
+You can use external OpenID Providers like Google, Keycloak, ... to allow your users to sign into Libredesk.
+
+!!! Keep in mind
+    You still have to create the user accounts in Libredesk, they do not get created automatically.
+
+## Keycloak
+
+1. Go to your keycloak admin console and create a new client.
+2. xxxxx
+
+## Other providers
+
+You can use them, but there is currently no documentation for it. Feel free to change that!