Suggestion: Update documentation for new mpc

[mikkoairaksinen]

While it is awesome that mpc should now work on Linux and MacOs, the documentation on how to make that happen is very unclear. It would be extremely beneficial to have an example project setup (or a written doc) detailing the (likely extremely common) use case of:

1. .NET Core server project
2. Unity project with subset of the code that is shared with the server project (and subset of that code is decorated with [MessagePackObject] etc
3. an example .csproj somewhere in this project that can be used as the input for mpc
4. a pre-build step configured into the server project that runs mpc (with detection of operating system to run the correct build of mpc)

I would be happy to contribute this documentation but frankly I don't know how to steps 3 and 4. Most attempts at 3 so far have either yielded an empty GeneratedResolver file or just not worked at all (when on MacOS)

[neuecc]

You're right and thanks, welcome to contribute.
Current MacOS compatibility is slightly broken. #355
We should fix it but it is difficult.

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