feat: Add day 1

AdventOfCode2026/Program.cs

@@ -0,0 +1,34 @@
+namespace AdventOfCode2026;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        const int numberOfDays = 12;
+        foreach (var day in Enumerable.Range(1, numberOfDays))
+        {
+            RunDay(day);
+        }
+    }
+    
+    private static void RunDay(int day)
+    {
+        var solutionText = $"Solution for Day {day.ToString().PadLeft(2, '0')}:";
+        var className = $"Day{day}";
+        var classType = Type.GetType($"AdventOfCode2026.{className}");
+        if (classType == null)
+        {
+            Console.WriteLine($"{solutionText} is not implemented.");
+            return;
+        }
+        var instance = Activator.CreateInstance(classType);
+        if (instance is not Solution solution)
+        {
+            throw new NotImplementedException($"{classType} is not implemented.");
+        }
+        
+        Console.WriteLine($"{solutionText}");
+        Console.WriteLine($"\tPart 1: {solution.SolvePart1()}");
+        Console.WriteLine($"\tPart 2: {solution.SolvePart2()}");
+    }
+}