feat: added export to csv file

ResultWriter.cs

@@ -0,0 +1,50 @@
+using System.Globalization;
+using CsvHelper;
+
+namespace TelegramMessageCounter;
+
+public static class ResultWriter
+{
+    public static void SaveStatsToTxt(List<CounterInfo> infos, string path = "results.txt")
+    {
+        Console.ForegroundColor = ConsoleColor.Yellow;
+        Console.Write($"Saving results to {path}...");
+        string fileData = "";
+        float multiplier = 0;
+        foreach (CounterInfo info in infos)
+        {
+            fileData += "username: " + info.TargetUsername + "\n" +
+                        "message multiplier (You/Target): " + info.MessageMultiplier + "\n" + 
+                        "symbol multiplier (You/Target): " + info.SymbolsMultiplier + "\n" + 
+                        "total messages: " + info.FullMessageCount + "\n" +
+                        "your messages: " + info.UserMessageCount + "\n" +
+                        "target messages: " + info.TargetMessageCount + "\n" +
+                        "your symbols in messages: " + info.UserSymbolsCount + "\n" +
+                        "target symbols in messages: " + info.TargetSymbolsCount + "\n-----\n";
+            multiplier += info.MessageMultiplier;
+        }
+        multiplier /= infos.Count;
+        Console.ForegroundColor = ConsoleColor.Green;
+        Console.WriteLine("[DONE]");
+        Console.ForegroundColor = ConsoleColor.White;
+        Console.WriteLine($"Middle result is: {multiplier}");
+        File.WriteAllText(path, fileData);
+        Console.WriteLine("Goodbye!");
+    }
+
+    public static void SaveStatsToCsv(List<CounterInfo> infos, string path = "results.csv")
+    {
+        Console.ForegroundColor = ConsoleColor.Yellow;
+        Console.Write($"Saving results to {path}...");
+        
+        using (var writer = new StreamWriter(path))
+        using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
+        {
+            csv.WriteRecords(infos);
+        }
+        Console.ForegroundColor = ConsoleColor.Green;
+        Console.WriteLine("[DONE]");
+        Console.ForegroundColor = ConsoleColor.White;
+        Console.WriteLine("Goodbye!");
+    }
+}