Update README.md

Author: openmaxwell

README.md

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 This is the source codes of the latest version (21A) of OpenMaXwell. 
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 Requirements:
 1) Visual Studio 2019 with the MFC support included (Community version is used)
 2) Intel OneAPI Base Toolkit (https://software.intel.com/content/www/us/en/develop/tools/oneapi/base-toolkit/download.html)
 3) Intel OneAPI HPC Toolkit (https://software.intel.com/content/www/us/en/develop/tools/oneapi/hpc-toolkit/download.html)
 4) The locations of the MKL and Compiler libraries should be updated in the MaX.sln file under (if they are installed to a non-default location)
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   a) Properties -- Linker -- Additional Library Directories
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   b) Properties -- Fortran -- Additional Library Directories