Add Grid<T>

src/ProjectEuler/ProjectEuler.Problems/Helpers/Grid.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace ProjectEuler.Problems.Helpers
+{
+    public class Grid<T>
+    {
+        public T[,] Values { get; }
+
+        public T this[int col, int row]
+        {
+            get => Values[col, row];
+            set => Values[col, row] = value;
+        }
+
+        public int ColCount { get; }
+        public int RowCount { get; }
+
+        public Grid(int colCount, int rowCount)
+        {
+            if (colCount < 1 || rowCount < 1)
+                throw new ArgumentOutOfRangeException();
+
+            ColCount = colCount;
+            RowCount = rowCount;
+            Values   = new T[ColCount, RowCount];
+        }
+    }
+}

src/ProjectEuler/ProjectEuler.Problems/Solutions/Problem007.cs

@@ -12,7 +12,7 @@ public class Problem007 : IProblem
         public int Id => 7;
         public string Title => "10001st prime";
 
-        private const int UpperBound = 10001;
+        public const int UpperBound = 10001;
 
         public string Description =>
             "By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, " +