Support for HDF5?

### Question about importer

Hello ML.NET Team,

It's so amazing to see that we .NET People really got a spark or scikit like Framework! From what I saw we can be proud of. 👍

Now the question

**Did you consider to write HDF5 importer?**

Maybe I should explain. HDF5 is a very flexible and great data Format which is often used in Simulation area - the MATLAB file Format *.mat bases on HDF5. There exist many Python and Java Projects for HDF5 if you look at Github and on their web page https://portal.hdfgroup.org/display/support. But I really missing us .NET developers in this area. We have C#, F# and Powershell (also have VB.NET) and I find it would be good for .NET and the HDF5 if we work together. ;)

Maybe a 2nd hint to Microsoft and ML.NET Team - there exist also the Project HDFql for SQL like query for my data - Image like "give me all Arrays with have a tag "Temperatur" or "give me all data with unit "°C". ^^