Initial checkin of gRPC to third_party/

third_party/grpc/examples/csharp/helloworld/README.md

+gRPC in 3 minutes (C#)
+========================
+
+BACKGROUND
+-------------
+For this sample, we've already generated the server and client stubs from [helloworld.proto][].
+
+Example projects depend on the [Grpc](https://www.nuget.org/packages/Grpc/)
+and [Google.Protobuf](https://www.nuget.org/packages/Google.Protobuf/) NuGet packages
+which have been already added to the project for you.
+
+PREREQUISITES
+-------------
+**Windows**
+- .NET 4.5+
+- Visual Studio 2013 or 2015
+
+**Linux**
+- Mono 4.0+
+- Monodevelop 5.9+ (with NuGet plugin installed)
+
+**Mac OS X**
+- Xamarin Studio 5.9+
+- [homebrew][]
+
+BUILD
+-------
+
+- Open solution `Greeter.sln` with Visual Studio, Monodevelop (on Linux) or Xamarin Studio (on Mac OS X)
+
+- Build the solution (this will automatically download NuGet dependencies)
+
+Try it!
+-------
+
+- Run the server
+
+  ```
+  > cd GreeterServer/bin/Debug
+  > GreeterServer.exe
+  ```
+
+- Run the client
+
+  ```
+  > cd GreeterClient/bin/Debug
+  > GreeterClient.exe
+  ```
+
+You can also run the server and client directly from the IDE.
+
+On Linux or Mac, use `mono GreeterServer.exe` and `mono GreeterClient.exe` to run the server and client.
+
+Tutorial
+--------
+
+You can find a more detailed tutorial in [gRPC Basics: C#][]
+
+[homebrew]:http://brew.sh
+[helloworld.proto]:../../protos/helloworld.proto
+[gRPC Basics: C#]:http://www.grpc.io/docs/tutorials/basic/csharp.html