Updating ReadData and add nhdf

[jamesrussell216]

Parent issue: #7

This example needs updating with modern practices and we'd like to add in an example to show nhdf format reading.

[cmeyer]

• NHDF https://gist.github.com/cmeyer/84ca01974369d9b2841ddf8f0ff212d2
• ndata1 https://gist.github.com/cmeyer/f3f1cc37afd7f65c13b9c8addb92d3d6

[jamesrussell216]

• NHDF https://gist.github.com/cmeyer/84ca01974369d9b2841ddf8f0ff212d2
• ndata1 https://gist.github.com/cmeyer/f3f1cc37afd7f65c13b9c8addb92d3d6

Reading between the lines a little there @cmeyer am I OK to just PRs based off those two?