Add project files.

ModVersionChecker/managers/filesystem/SourcesDefManager.cs

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+using ModVersionChecker.data.model;
+using ModVersionChecker.managers.interfaces;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+
+namespace ModVersionChecker.managers.filesystem
+{
+    public class SourcesDefManager
+    {
+        private readonly string _filePath = Path.Combine(AppContext.BaseDirectory, "data", "sourcesDef.json");
+        private List<SourceDef> _sourcesDef = new List<SourceDef>();
+
+        public SourcesDefManager()
+        {
+            _sourcesDef = Load();
+        }
+
+        private List<SourceDef> Load()
+        {
+            if (!File.Exists(_filePath))
+                return new List<SourceDef>();
+            var json = File.ReadAllText(_filePath);
+            return JsonSerializer.Deserialize<List<SourceDef>>(json) ?? new();
+        }
+
+        public List<SourceDef> GetSourcesDef()
+        {
+            return _sourcesDef;
+        }
+
+        public void AddSourceDef(SourceDef sourceDef)
+        {
+            _sourcesDef.Add(sourceDef);
+            Save(_sourcesDef);
+        }
+
+        public void RemoveSourceDef(string id)
+        {
+            _sourcesDef.RemoveAll(s => s.Id == id);
+            Save(_sourcesDef);
+        }
+        
+
+        public void Save(List<SourceDef> sourcesDef)
+        {
+            var options = new JsonSerializerOptions { WriteIndented = true };
+            var json = JsonSerializer.Serialize(sourcesDef, options);
+            File.WriteAllText(_filePath, json);
+        }
+    }
+}