Initialize repository

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

RecRoomArchive.Models/API/Config/MatchmakingParams.cs

@@ -0,0 +1,10 @@
+using System.Text.Json.Serialization;
+
+namespace RecRoomArchive.Models.API.Config
+{
+    public class MatchmakingParams
+    {
+        [JsonPropertyName(name: "PreferFullRoomsFrequency")] public float PreferFullRoomsFrequency { get; set; } = 1.0f;
+        [JsonPropertyName(name: "PreferEmptyRoomsFrequency")] public float PreferEmptyRoomsFrequency { get; set; } = 0.0f;
+    }
+}