Add project files.

AspNetCore.Extensions/Websockets/Converters/JsonWebSocketMessageConverter.cs

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+using AspNetCore.Extensions.Attributes;
+using System.Core.Extensions;
+using System.Text;
+using System.Text.Json;
+
+namespace AspNetCore.Extensions.Websockets.Converters;
+
+public class JsonWebSocketMessageConverter<T> : WebSocketMessageConverter<T>
+{
+    private readonly JsonSerializerOptions? jsonSerializerOptions;
+
+    [DoNotInject]
+    public JsonWebSocketMessageConverter()
+    {
+    }
+
+    public JsonWebSocketMessageConverter(JsonSerializerOptions options)
+    {
+        this.jsonSerializerOptions = options.ThrowIfNull();
+    }
+
+    public override T ConvertTo(WebSocketConverterRequest request)
+    {
+        if (request.Type != System.Net.WebSockets.WebSocketMessageType.Text)
+        {
+            throw new InvalidOperationException($"Unable to deserialize message. Message is not text");
+        }
+
+        var stringData = Encoding.UTF8.GetString(request.Payload!);
+        var objData = JsonSerializer.Deserialize<T>(stringData, this.jsonSerializerOptions);
+        return objData ?? throw new InvalidOperationException($"Unable to deserialize message to {typeof(T).Name}");
+    }
+
+    public override WebSocketConverterResponse ConvertFrom(T message)
+    {
+        var serialized = JsonSerializer.Serialize(message, this.jsonSerializerOptions);
+        var data = Encoding.UTF8.GetBytes(serialized);
+        return new WebSocketConverterResponse { EndOfMessage = true, Type = System.Net.WebSockets.WebSocketMessageType.Text, Payload = data };
+    }
+}