Initialize repository

Added basic info to get in game for like...August 2016 ;-;
It's not much but it's a start

RecRoomArchive.Models/Common/OkResponse.cs

@@ -0,0 +1,13 @@
+using System.Text.Json.Serialization;
+
+namespace RecRoomArchive.Models.Common
+{
+    public class OkResponse
+    {
+        public static OkResponse Ok(string? message = null) => new() { Success = true, Message = message };
+        public static OkResponse Fail(string message) => new() { Success = false, Message = message };
+
+        [JsonPropertyName("Success")] public bool Success { get; set; }
+        [JsonPropertyName("Message")] public string? Message { get; set; }
+    }
+}