Add unit tests for LeetCode #35 'Search Insert Position'.

LeetCode/tests/LeetCode.Challenges.UnitTests/Problems00xx/N_0035_SearchInsertPosition/SolutionTests.cs

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+using Xunit;
+using LeetCode.Challenges.Problems00xx.N_0035_SearchInsertPosition;
+using Shouldly;
+
+namespace LeetCode.Challenges.UnitTests.Problems00xx.N_0035_SearchInsertPosition;
+
+public class SolutionTests
+{
+    [Theory]
+    [MemberData(nameof(TestData))]
+    public void GivenNumbersAndTarget_WhenSearchInsert_ThenResultAsExpected(int[] nums, int target, int expected)
+    {
+        var result = Solution.SearchInsert(nums, target);
+        result.ShouldBe(expected);
+    }
+
+    public static IEnumerable<object[]> TestData()
+    {
+        yield return [new[] { 1, 3, 5, 6 }, 5, 2];
+        yield return [new[] { 1, 3, 5, 6 }, 2, 1];
+        yield return [new[] { 1, 3, 5, 6 }, 7, 4];
+        yield return [new[] { 1, 3, 5, 6 }, 0, 0];
+        yield return [new[] { 1 }, 0, 0];
+        yield return [new[] { 1 }, 1, 0];
+        yield return [new[] { 1, 3 }, 2, 1];
+    }
+}