Added dotnet FCast client.

clients/terminal-dotnet/FCastClient/Models.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Text.Json.Serialization;
+
+public class PlayMessage
+{
+    [JsonPropertyName("container")]
+    public required string Container { get; set; }
+
+    [JsonPropertyName("url")]
+    public string? Url { get; set; }
+
+    [JsonPropertyName("content")]
+    public string? Content { get; set; }
+
+    [JsonPropertyName("time")]
+    public double? Time { get; set; }
+
+    [JsonPropertyName("speed")]
+    public double? Speed { get; set; }
+
+    [JsonPropertyName("headers")]
+    public Dictionary<string, string>? Headers { get; set; }
+}
+
+public class SeekMessage
+{
+    [JsonPropertyName("time")]
+    public required double Time { get; set; }
+}
+
+public class PlaybackUpdateMessage
+{
+    [JsonPropertyName("time")]
+    public required double Time { get; set; }
+
+    [JsonPropertyName("duration")]
+    public required double Duration { get; set; }
+
+    [JsonPropertyName("speed")]
+    public required double Speed { get; set; }
+
+    [JsonPropertyName("state")]
+    public required int State { get; set; } // 0 = None, 1 = Playing, 2 = Paused
+}
+
+public class VolumeUpdateMessage
+{
+    [JsonPropertyName("volume")]
+    public required double Volume { get; set; } // (0-1)
+}
+
+public class SetVolumeMessage
+{
+    [JsonPropertyName("volume")]
+    public required double Volume { get; set; }
+}
+
+public class SetSpeedMessage
+{
+    [JsonPropertyName("speed")]
+    public required double Speed { get; set; }
+}
+
+public class PlaybackErrorMessage
+{
+    [JsonPropertyName("message")]
+    public required string Message { get; set; }
+}
+
+public class VersionMessage
+{
+    [JsonPropertyName("version")]
+    public required ulong Version { get; set; }
+}