Updated Hello ADIOS2 Write Example (markdown) authored by williamfgc's avatar williamfgc
In order to introduce the classes and application user interface (API) in C++11. A Hello Write/Read example will illustrate the typical interaction between the ADIOS2 core class components [ADIOS2/examples/hello/bpReader/helloBPReaderHeatMap2D.cpp](https://github.com/ornladios/ADIOS2/blob/master/examples/hello/bpReader/helloBPReaderHeatMap2D.cpp).
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