add README

README.md

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+# OpenMatch C# API
+
+[![Nuget](https://img.shields.io/nuget/dt/OpenMatch.Api)](https://www.nuget.org/packages/OpenMatch.Api/) [![Azure Pipelines](https://img.shields.io/azure-devops/build/arsenstudio/4f5c7cb3-18f7-4b44-ab1e-c9a6a6e38873/5)](https://arsenstudio.visualstudio.com/OpenMatch%20CSharp/)
+
+
+# Usage
+
+```sh
+dotnet add package OpenMatch.Api
+```
+
+## Getting started
+
+### Client
+
+```c#
+// Create the grpc.
+using var channel = GrpcChannel.ForAddress("https://localhost:5001");
+
+var frontendClient  = new OpenMatch.FrontendService.FrontendServiceClient(channel);
+
+await frontendClient.CreateTicketAsync(request); 
+```
+
+There is others services:
+- `OpenMatch.FrontendService.FrontendServiceClient`
+- `OpenMatch.BackendService.BackendServiceClient`
+- `OpenMatch.EvaluatorService.EvaluatorServiceClient`
+- `OpenMatch.MatchFunction.MatchFunctionServiceClient`
+- `OpenMatch.QueryService.QueryServiceClient`
+
+
+See [Open Match API References](https://open-match.dev/site/docs/reference/api/) for more informations.
+
+
+## Contributing
+
+Please see [CONTRIBUTING.md](CONTRIBUTING.md) for instructions on how to contribute.