Add AppVeyor CI integration

[MikeGoldsmith]

No description provided.

[cwe1ss]

I merged #82 which contains the config file for AppVeyor.

I also set up an "OpenTracing" account on AppVeyor to speed things up. It currently contains the following projects:

• https://ci.appveyor.com/project/opentracing/opentracing-csharp
• https://ci.appveyor.com/project/opentracing/csharp-netcore (from opentracing-contrib)

There's still a few things to do though - @bhs @tedsuo @yurishkuro, I hope one of you can help me here:

• I'm currently the only administrator of the account. Who else should be an admin? (to add/delete projects, change GitHub access etc.) I would need the email addresses - if you don't want to post them here, feel free to send them to me via email: [email protected]
• I don't have administrative rights in this project so AppVeyor didn't set up the web hooks to automatically trigger builds. Would it be ok to make me an admin here with the same rights as csharp-netcore (where I was able to set everything up properly)? If so, then I can finish the setup - otherwise one of you has to do that once you're an admin in the AppVeyor account.

[bhs]

@cwe1ss I granted you admin access to this repo – hope that helps!

If you just want another person to be an admin for "safety" reasons, feel free to add me (bhs at lightstep dot com); though I won't be very useful since I barely know C#.

[MikeGoldsmith]

I'd be happy to help out with AppVeyor / Github admin duties.

[cwe1ss]

@bhs thank you, I was able to connect the project! Yes, the admin access is mainly for safety/redundancy.

@MikeGoldsmith I can add you as well if you post/send me your email address.

[cwe1ss]

@MikeGoldsmith sent me his email address and I added him as an administrator as well.

[cwe1ss]

The AppVeyor integration now works. The current release process is:

• Add & push tag to git repository (tag name MUST be a proper semantic version)
• Wait for AppVeyor build to succeed -> it will create a GitHub release for the tag
• Edit the GitHub release notes
• Publish to NuGet.org via AppVeyor (via "Deploy" link on the build details - Deployment target "NuGet (OpenTracing)"

[yurishkuro]

Do you mind adding instructions to RELEASE.md?

[cwe1ss]

@yurishkuro yes, I created #101 to track it.