Add project files.

AOC Runner/ProblemInfoAttribute.cs

@@ -0,0 +1,13 @@
+namespace AOC.Runner;
+public class ProblemInfoAttribute : Attribute
+{
+	public int Day { get; init; }
+	public string Year { get; init; }
+	public string Name { get; init; }
+	public ProblemInfoAttribute(string year, int day, string name)
+	{
+		Year = year;
+		Day = day;
+		Name = name;
+	}
+}