Update Readme

Author: diehlpk

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about.md

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 Webpage of the [Book](https://link.springer.com/book/10.1007/978-3-031-54369-2) "Parallel C++: Efficient and Scalable High-Performance Parallel Programming Using HPX".
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+The examples are available on [GitHub](https://github.com/ModernCPPBook/Examples) and the C++ Explorer is available on [GitHub](https://github.com/stevenrbrandt/CxxExplorer).
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+This blog will showcase new features of the C++ 23 and C++ 26 standard mentioned in the book.