Update README.md

Fix links and improve description

Author: kwin

README.md

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 Access Control Tool for Adobe Experience Manager
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-The Access Control Tool for Adobe Experience Manager (AC Tool) simplifies the specification and deployment of complex [Access Control Lists in AEM](http://docs.adobe.com/docs/en/cq/current/administering/security.html#Access%20Control%20Lists%20and%20how%20they%20are%20evaluated).
+The Access Control Tool for Adobe Experience Manager (AC Tool) simplifies the specification and deployment of complex [Access Control Lists in AEM](https://experienceleague.adobe.com/docs/experience-manager-65/administering/security/security.html?lang=en#permissions-in-aem) as well as users and groups.
 Instead of existing solutions that build e.g. a content package with actual ACL nodes you can write simple configuration files and deploy them with your content packages. See [comparison to other approaches](docs/Comparison.md) for a comprehensive overview.
 
 Features:
 
-* easy-to-read Yaml configuration file format
+* easy-to-read [Yaml](https://yaml.org/) configuration file format
 * run mode support
 * automatic installation with install hook
 * cleans obsolete ACL entries when configuration is changed
 * ACLs can be exported
+* management of user's key stores and the global trust store
 * stores history of changes
 * ensured order of ACLs
 * built-in expression language to reduce rule duplication