DotNet andd C++ example

README.md

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+Quick test on how to dip into C/C++ from C# using your own shared C++ libraries
+
+
+# Building
+Building and testing is quite quick and only involves several steps. Before proceeding, it should be noted that this quick test targets Linux. This makes a difference because in Linux C++ shared libraries have a *.so file extension compared to Windows having a *.dll file extension. The ``Program.cs`` file is looking for a shared library with an extension ending is *.so. As is this test will not work on Windows without some modifications.
+
+### Required
+* Linux
+* .NET Core 3.1
+* GCC >= 7 or clang >= 7
+
+## Building C++ library
+1. Change into the C++ Libs directory and create a build directory
+```Bash
+cd Libs; mkdir build
+```
+2. Build the C++ library
+```Bash
+cd build; cmake -DCMAKE_BUILD_TYPE=DEBUG ..; make
+```
+3. Copy the library to the root of the project
+```Bash
+cp libTestExample.so ../../
+```
+
+## Building .NET console software
+1. Ensure that you are in the root of the project. Then build the software
+```Bash
+dotnet build
+```
+2. Copy the C++ library to where the executable is build
+```Bash
+cp libTestExample.so bin/Debug/netcoreapp3.1/
+```
+3. Run the software
+```Bash
+dotnet run
+```
+4. The .NET code is calling a function from the C++ library that was built. The result is the sum of two integers