Add project files.

ModVersionChecker/managers/filesystem/ConfigManager.cs

@@ -0,0 +1,40 @@
+using ModVersionChecker.data.model;
+using ModVersionChecker.managers.interfaces;
+using System;
+using System.IO;
+using System.Text.Json;
+
+namespace ModVersionChecker.managers.filesystem
+{
+    public class ConfigManager : IConfigManager
+    {
+
+        private static readonly string _filePath = Path.Combine(AppContext.BaseDirectory, "data", "config.json");
+        private GlobalConfig _config;
+
+        public ConfigManager()
+        {
+            _config = Load();
+        }
+
+        public GlobalConfig Load()
+        {
+            if (!File.Exists(_filePath))
+                return new GlobalConfig();
+            var json = File.ReadAllText(_filePath);
+            return JsonSerializer.Deserialize<GlobalConfig>(json) ?? new GlobalConfig();
+        }
+
+        public GlobalConfig GetConfig()
+        {
+            return _config;
+        }
+
+        public void Save(GlobalConfig config)
+        {
+            var options = new JsonSerializerOptions { WriteIndented = true };
+            var json = JsonSerializer.Serialize(config, options);
+            File.WriteAllText(_filePath, json);
+        }
+    }
+}