Add project files.

AOC Runner/IProblemBase.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AOC.Runner;
+public interface IProblemBase
+{
+	void LoadInput();
+
+	void CalculatePart1();
+
+	void PrintPart1();
+
+	void CalculatePart2();
+	void PrintPart2();
+}