More C# progress

extra/admin-api/Models/Spacebar.Models.Gateway/CloseCode.cs

@@ -0,0 +1,19 @@
+namespace Spacebar.Models.Gateway;
+
+public enum CloseCode {
+    UnknownError = 4000,
+    UnknownOpcode = 4001,
+    DecodeError = 4002,
+    NotAuthenticated = 4003,
+    AuthenticationFailed = 4004,
+    AlreadyAuthenticated = 4005,
+    InvalidSession = 4006,
+    InvalidSeq = 4007,
+    RateLimited = 4008,
+    SessionTimedOut = 4009,
+    InvalidShard = 4010,
+    ShardingRequired = 4011,
+    InvalidApiVersion = 4012,
+    InvalidIntent = 4013,
+    DisallowedIntent = 4014,
+}