Add meta and settings json

ALttPRandomizer/JsonOptions.cs

@@ -0,0 +1,15 @@
+namespace ALttPRandomizer {
+    using System.Text.Json;
+    using System.Text.Json.Serialization;
+
+    public static class JsonOptions {
+        public static JsonSerializerOptions Default = new JsonSerializerOptions() {
+            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
+        }.WithStringEnum();
+
+        public static JsonSerializerOptions WithStringEnum(this JsonSerializerOptions options) {
+            options.Converters.Add(new JsonStringEnumConverter());
+            return options;
+        }
+    }
+}