Add project files.

ModVersionChecker/utils/VersionUtils.cs

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+using ModVersionChecker.data.model;
+using System.Text.Json;
+using System.Text.RegularExpressions;
+
+namespace ModVersionChecker.utils
+{
+    public static class VersionUtils
+    {
+        public static string GetCurrentVersion(AppConfig app, FsModPathConfig config)
+        {
+            var versionConfig = app.FsFields;
+            var packageName = versionConfig["msfs2024"]["package"];
+            var fsPath = config.Path;
+            var fsFile = config.File;
+            var fsFileType = config.FileType;
+            var fsKey = config.Key;
+            
+            var filePath = Path.GetFullPath(Path.Combine(fsPath, packageName, fsFile));
+
+            if (!File.Exists(filePath))
+            {
+                return ""; // Fallback
+            }
+
+            try
+            {
+                var content = File.ReadAllText(filePath).Trim();
+                if (string.IsNullOrEmpty(content))
+                {
+                    throw new Exception($"Empty file: {filePath}");
+                }
+                
+                using var jsonDoc = JsonDocument.Parse(content);
+                var element = jsonDoc.RootElement;
+                foreach (var key in fsKey.Split('.'))
+                {
+                    if (!element.TryGetProperty(key, out var nextElement))
+                    {
+                        throw new Exception($"JSON key '{key}' not found in {filePath}");
+                    }
+                    element = nextElement;
+                }
+                if (element.ValueKind != JsonValueKind.String)
+                {
+                    throw new Exception($"JSON value for '{fsKey}' is not a string in {filePath}");
+                }
+
+                var version = element.GetString()!;               
+
+                return version;
+            }
+            catch (Exception ex)
+            {
+                throw new Exception($"Error reading or processing file '{filePath}': {ex.Message}");
+            }
+        }
+    }
+}