Initial commit, basic proxying working

Myriad/Gateway/Payloads/GatewayHello.cs

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+namespace Myriad.Gateway
+{
+    public record GatewayHello(int HeartbeatInterval);
+}

Myriad/Gateway/Payloads/GatewayIdentify.cs

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+using System.Text.Json.Serialization;
+
+namespace Myriad.Gateway
+{
+    public record GatewayIdentify
+    {
+        public string Token { get; init; }
+        public ConnectionProperties Properties { get; init; }
+
+        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public bool? Compress { get; init; }
+
+        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public int? LargeThreshold { get; init; }
+
+        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public ShardInfo? Shard { get; init; }
+
+        public GatewayIntent Intents { get; init; }
+
+        public record ConnectionProperties
+        {
+            [JsonPropertyName("$os")] public string Os { get; init; }
+            [JsonPropertyName("$browser")] public string Browser { get; init; }
+            [JsonPropertyName("$device")] public string Device { get; init; }
+        }
+    }
+}

Myriad/Gateway/Payloads/GatewayResume.cs

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+namespace Myriad.Gateway
+{
+    public record GatewayResume(string Token, string SessionId, int Seq);
+}

Myriad/Gateway/Payloads/GatewayStatusUpdate.cs

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+using System.Collections.Generic;
+
+using Myriad.Types;
+
+namespace Myriad.Gateway
+{
+    public record GatewayStatusUpdate
+    {
+        public enum UserStatus
+        {
+            Online,
+            Dnd,
+            Idle,
+            Invisible,
+            Offline
+        }
+
+        public ulong? Since { get; init; }
+        public ActivityPartial[]? Activities { get; init; }
+        public UserStatus Status { get; init; }
+        public bool Afk { get; init; }
+    }
+}