Add .NET Core 3.0 tcp client

[rickardraysearch]

No description provided.

[rickardraysearch]

This is tentatively under MIT license, to minimize legal headaches when using this library. Is that a problem?

[Wasta-Geek]

Hi,
Thank you for developing a C# client ! I suppose your needed it for your project, may I ask in which context did you use this client ?
For your question, it's fine with the MIT license ! I don't have time this week but I'll have a look at your code, I'll test it later and get back to you if there is something wrong.
Thank you for your interest !

[rickardraysearch]

Thanks! The project is to build a teaching model of a radiotherapy treatment system, which uses a robot arm for positioning a patient in front of a proton therapy beam.

[rickardraysearch]

This PR is essentially obsolete now, if my newer pull request #38 that slightly alters the TCP protocol to have newlines after each response is accepted.