Moved Frame models, added default providers

src/Discord.Net.Rpc/API/RpcFrame.cs

@@ -0,0 +1,20 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+using System;
+
+namespace Discord.API.Rpc
+{
+    internal class RpcFrame
+    {
+        [JsonProperty("cmd")]
+        public string Cmd { get; set; }
+        [JsonProperty("nonce")]
+        public Optional<Guid?> Nonce { get; set; }
+        [JsonProperty("evt")]
+        public Optional<string> Event { get; set; }
+        [JsonProperty("data")]
+        public Optional<object> Data { get; set; }
+        [JsonProperty("args")]
+        public object Args { get; set; }
+    }
+}