feat: 🙈 Add gitignore

Lecture/Exercises/Conversion.cs

@@ -0,0 +1,16 @@
+namespace Lecture.Exercises;
+
+public class Conversion
+{
+    public static int StringToInt(string number)
+    {
+        int res = 0;
+
+        for (int i = 0; i < 6; i++)
+        {
+            res = res * 10 + int.Parse(number[i].ToString());
+        }
+        
+        return res;
+    }
+}