message: docs: validation
  A note on implementing validation is added
diff: @@ -27,6 +27,8 @@ You can see examples of the configurations in the [config-example.json](https://
  - [Compute Offering Classes](#compute-offering-classes)
  - [Service Offering Availability](#service-offering-availability)
  +*Note*: We implement validation to all configuration parameter values. Please, make sure you provide correct and valid values in your `config.json`.
  +
  ## General
  ### Default Domain
  