chore: add README

Signed-off-by: D4ryl00 <[email protected]>

examples/UnityClient/README.md

@@ -0,0 +1,37 @@
+# gRPC .NET client with Unity
+
+This example folder implements a
+[.NET gRPC](https://github.com/grpc/grpc-dotnet) client with Unity.
+
+## Usage
+
+In a terminal, go to `gnonative/goserver` and run the gRPC server:
+
+```bash
+go run . tcp -addr 127.0.0.1:7042
+```
+
+In Unity Hab, import this folder.
+
+In Unity, select the `SampleScene` in `Assets/Scenes`. Play the project, click
+on the button and look at the result in the text object.
+
+## Structure
+
+`Assets/Scenes/SampleScene.unity` is the Unity scene we use for the demo. We
+implemented a button to start an action, and a text object to print the result.
+
+`Assets/GnoClient.cs` is the script where lives the gRPC client. The `Start()`
+method initializes the client on a fixed local port (`7042`). When you click on
+the button object on the scene, the `OnHello` method calls the gRPC `Hello` call
+and print the result on the text object.
+
+`Assets/Gno` contains a copy of the generated GnoNative API files and gRPC C#
+stubs (`api/gen/csharp`).
+
+## Nuget package management
+
+The gRPC .NET client is avalaible through the Nuget ecosystem. Unity doesn't
+support it natively, so we had to add a module
+([NuGetForUnity](https://github.com/GlitchEnzo/NuGetForUnity)) to be able to
+install it easily. We installed the `Grpc.Net.Client` family packages.