```ruby
require 'json'

module Rubella
  module Input

    #
    #
    class JSON
      attr_reader :data

      # Constructor
      # This constructer can create a new Rubella::Input::JSON object, but it
      # is supposed to be private. Please use Rubella::Input::JSON.string or
      # Rubella::Input::JSON.file to create a new instance.
      #
      # @param json__string string A string, which contains the data as json
      # @return Rubella::Input::JSON
      def initialize(json_string)
        @data = ::JSON::load(json_string)
      end

      # Constructor
      # Creates a new Rubella::Input::JSON object, from the given json.
      #
      # @param json_string string A string, which contains the data as json
      # @return Rubella::Input::JSON
      def self.string(json_string)
        self.new(json_string)
      end

      # Constructor
      # Creates a new Rubella::Input::JSON object, from the given file.
      # Only the file name is required.
      #
      # @param json_file string The name of the file, which json contains
      # @return Rubella:Input::JSON
      def self.file(json_file)
        self.new File.new(json_file, 'r')
      end

    end

  end
end```

Add documentation and TODOs for JSON input
user
```ruby
require 'json'

module Rubella
  module Input

    # Gets data in JSON formate and translate it into a Ruby readable form to
    # make it possible to handle the data.
    #
    # TODO The validation of the data should happen here
    # Check if data is array, with subarrays. Check, that all sub array have
    # the same size. Check that all the content are numeric values between 0
    # and 100.
    #
    class JSON
      attr_reader :data

      # Constructor
      # This constructer can create a new Rubella::Input::JSON object, but it
      # is supposed to be private. Please use Rubella::Input::JSON.string or
      # Rubella::Input::JSON.file to create a new instance.
      #
      # @param json__string string A string, which contains the data as json
      # @return Rubella::Input::JSON
      def initialize(json_string)
        @data = ::JSON::load(json_string)
      end

      # Constructor
      # Creates a new Rubella::Input::JSON object, from the given json.
      #
      # @param json_string string A string, which contains the data as json
      # @return Rubella::Input::JSON
      def self.string(json_string)
        self.new(json_string)
      end

      # Constructor
      # Creates a new Rubella::Input::JSON object, from the given file.
      # Only the file name is required.
      #
      # @param json_file string The name of the file, which json contains
      # @return Rubella:Input::JSON
      def self.file(json_file)
        self.new File.new(json_file, 'r')
      end

    end

  end
end```
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