Using language server protocal requires project.json file present in project

[LucasBullen]

When connecting a Java client to the omnisharp-node-client Language Server implementation no output is received without a project.json file present.

The requirements for .NET Core have changed with v2.0.0 replacing project.json files with the MSBuild/csproj format (https://docs.microsoft.com/en-us/dotnet/core/tools/project-json-to-csproj).

In regards to Issue #265, personally it was not whether the project was restored (As I restored the project with a .csproj file and had no output), but if a project.json file was present that enabled completion on my file.

[mickaelistria]

If I understand correctly, this one depends on #435

[mickaelistria]

Hurray! I tried the latest release v7.1.2 which uses omnisharp-roslyn 1.23.1 and it worked well on Fedora 26 for projects with *.csproj with a version recent of dotnet-core 2.0 and no dependency on mono!
I believe it's a pretty satisfying result from integrator and user POV, so we can close this issue.
Thanks for your assistance!