Update README.md

Author: codeconsole

README.md

@@ -13,3 +13,18 @@ See [documentation](https://grails-plugins.github.io/grails-spring-security-core
 - `4.0.x` compatible with Grails 4
 - `3.3.x` compatible with Grails 3.3.x
 - `3.2.x` compatible with Grails 3.2.x
+
+Grails 7 requires disabling any Spring Security Auto Configurations you may have in your classpath.  This can be done via annotation or `application.yml`
+e.g.
+```yml
+spring:
+  autoconfigure:
+    exclude:
+      - org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration
+      - org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration
+      - org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration
+      - org.springframework.boot.actuate.autoconfigure.security.servlet.ManagementWebSecurityAutoConfiguration
+      - org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientAutoConfiguration
+      - org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration
+      - org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration
+```