Alternative example of including an open-source library

[martinboers]

In relation to the example "How to include an open-source library in your own C++ project", there is another example of including the NE10 library (and the JsonCpp library) here:

https://www.plcnext-community.net/makersblog/how-to-use-visual-studio-code-to-write-c-for-plcnext/

It is worth mentioning this alternative solution in the README for this example.