Create basic addon for Archicad 22

Question

I install Archicad 22 and Visual Studio 2017. I have Developer API for Archicad. I try to see how it works the example from Archicad Development Kit but when i import from example DC_test is Visual Studio i recive errors.

Can you help me please how to connect Visual Studio example to Archicad? Just bacis .. a line for example.

I want to learn C++ and C#

I want to create an addon like a "eptar reinforcement" I try to decompile but i cant

Sorry for my bad english.

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Thank you very mutch

EDIT:

I want to create an addon as in the image with ARCHICAD, image 3. Should not there be an open window in the visual studio as in C #? Which can you edit? Or does Visual Studio somehow connect to Archicad, make changes and they appear in Archicad? In addon?

Image 1

Image 2

Image 3

Image 4

Image 5