added TransientHDFReader
The goal of this example is to show how to read transient data from a HDF file using vtkHDFReader v2.0 (vtkHDFWriter 2.0 is not finished yet but another example will be added when it is).
Just for fun: live WASM preview is here: https://vtk-wasm-examples.s3.fr-par.scw.cloud/TransientHDFReader/index.html
Edited by Adrien Stucky