Datasets files in standard formats

[jairodelgado]

Include a reader classes to support input files in several standard formats. For the moment, it would be useful to consider:

• CSV format:
• ARFF format:
• LMBD format:
• HDF5 format:
• JSON format:

Please update the list as you implement the reader for each format. In addition, include web links to a description of each format as you proceed. I would like to see a separated comment clarifying how each format was implemented if needed.