anchor.diff:            "nickName": "New Nickname Value" 
           }
           
  -+ Response 200++ Response 200
  +
  +
  ++ Response 500 (application/json)
  +    
  +        {
  +            "errorMsg": "Modifying user nick name user failed"
  +        }
  +        
  +
  +## User Roles [/api/users/{user_id}/roles]
  +
  +### Change User Roles [PATCH]
  +
  ++ Request (application/merge-patch+json)
  +
  +        { 
  +          "roles": ["newRole1", "newRoleN"] 
  +        }
  +        
  ++ Response 200
  +
  +
  ++ Response 500 (application/json)
  +    
  +        {
  +            "errorMsg": "Modifying user roles failed"
positive.code: 
  Arij's project API
  
  ## Users collection [/api/users]
  
  ### List All Users [GET]
  
  
negative.code: 
  + Response 200
  
  + Response 500 (application/json)
      
          {
              "errorMsg": "Deactivating user failed"
          }
  
  ## User Nickname [/api/users/{user_id}/nickName]
  
  ### Change User Nickname [PATCH]
  
  + Request (application/merge-patch+json)
  