Update readme

* Update README.md

Author: voskvv

README.md

@@ -1,11 +1,22 @@
-# User service for Containerum Platform
+# user-manager
+User manager is a service for managing users, groups, credentials, user and domain blacklists for [Containerum](https://github.com/containerum/containerum).
+
+## Prerequisites
+* MongoDB 
 
-## Installation
 
+## Installation
 ### Using Helm
 
 ```
   helm repo add containerum https://charts.containerum.io
   helm repo update
   helm install containerum/user-manager
 ```
+
+## Contributions
+Please submit all contributions concerning user-manager component to this repository. 
+
+## License
+User-manager project is licensed under the terms of the Apache License Version 2.0. Please see LICENSE in this repository for more details.
+