readme: added short description of knot resolver

diff --git a/manager/README.md b/manager/README.md
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 # Knot Resolver Manager
 
+Knot Resolver Manager is a configuration tool for the [Knot Resolver](https://gitlab.nic.cz/knot/knot-resolver). The Manager hides the complexity of running several independent resolver processes while ensuring zero-downtime reconfiguration with YAML/JSON declarative configuration and an optional HTTP API for dynamic changes.
+
 ## Development environment
 
 ### Reproducible development environment