move examples to correct locations

examples/csharp/route_guide/README.md

examples/csharp/route_guide/RouteGuide.sln

.../csharp/route_guide/RouteGuide/Properties/AssemblyInfo.cs

examples/csharp/route_guide/RouteGuide/RouteGuide.cs

examples/csharp/route_guide/RouteGuide/RouteGuide.csproj

examples/csharp/route_guide/RouteGuide/RouteGuideGrpc.cs

examples/csharp/route_guide/RouteGuide/RouteGuideUtil.cs

examples/csharp/route_guide/RouteGuide/packages.config

...es/csharp/route_guide/RouteGuide/protos/route_guide.proto

examples/csharp/route_guide/RouteGuide/route_guide_db.json

examples/csharp/route_guide/RouteGuideClient/App.config

examples/csharp/route_guide/RouteGuideClient/Program.cs

...p/route_guide/RouteGuideClient/Properties/AssemblyInfo.cs

...harp/route_guide/RouteGuideClient/RouteGuideClient.csproj

examples/csharp/route_guide/RouteGuideClient/packages.config

examples/csharp/route_guide/RouteGuideServer/App.config

examples/csharp/route_guide/RouteGuideServer/Program.cs

...p/route_guide/RouteGuideServer/Properties/AssemblyInfo.cs

...les/csharp/route_guide/RouteGuideServer/RouteGuideImpl.cs

...harp/route_guide/RouteGuideServer/RouteGuideServer.csproj