Add .NET Client

[hawkerm]

@lee-11 and @mlhpdx I was looking at the network for Space Battle and stumbled upon your fork adding .NET Core support!

Would you be interested in helping to submit a PR to add it to our official repo?

The main comments I have on the implementation are:

• Use PascalCasing for methods to align to C# naming conventions
• Also allow typing 'quit' in the console to exit the program (I believe this should make it work to use with F5 in VS Code as well, as Ctrl+C doesn't work there).
• Copy the java example ships for the test ship directory as individual ship files.

[mlhpdx]

Yep. I was going to get back to this again soon. Still teaching Unit 3 right now, but I'll find some time to make this port a little nicer and if it makes sense PR it.