Added golf run shell to the two-sum problem test suite.

samples/Hussy.Net.Playground/Leetcode/Easy/TwoSum/GolfRun.cs

@@ -0,0 +1,25 @@
+namespace Hussy.Net.Playground.Leetcode.Easy;
+
+/// <summary>
+/// Represents a solution and its tests for the leetcode two-sum problem.
+/// </summary>
+/// <see href="https://leetcode.com/problems/two-sum/description/"/>
+public sealed partial class TwoSum
+{
+    /// <summary>
+    ///     A simple golf run to prepare for the Hussy run.
+    /// </summary>
+    /// <param name="numbers">The array of numbers to look through.</param>
+    /// <param name="target">
+    ///     The target number which the two numbers in <paramref name="numbers"/> must add up to.
+    /// </param>
+    /// <returns>
+    ///     The two indices of the numbers which add up to the <paramref name="target"/>.
+    /// </returns>
+    private static IEnumerable<int> GolfRun(
+        int[] numbers,
+        int target)
+    {
+        return Enumerable.Empty<int>();
+    }
+}

samples/Hussy.Net.Playground/Leetcode/Easy/TwoSum/Tests/Setup.cs

@@ -12,7 +12,8 @@ public sealed partial class TwoSum
     private static TestFunction[] TestFunctions =>
     [
         DryRun,
-        ComplexityRun
+        ComplexityRun,
+        GolfRun
     ];
 
     /// <summary>