Initial commit, basic proxying working

Myriad/Gateway/ClusterSessionState.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+
+namespace Myriad.Gateway
+{
+    public record ClusterSessionState
+    {
+        public List<ShardState> Shards { get; init; }
+
+        public record ShardState
+        {
+            public ShardInfo Shard { get; init; }
+            public ShardSessionInfo Session { get; init; }
+        }
+    }
+}