feat: initial implementation of input provider, ref: A24-7

LevelInputProvider.Tests/LevelInputProviderTest.cs

@@ -0,0 +1,16 @@
+namespace AoCLevelInputProvider.Tests;
+
+using AoCLevelInputProvider;
+
+public class LevelInputProviderTest
+{
+    [Fact]
+    public void Test1()
+    {
+        var lip = new LevelInputProvider();
+        string text = lip.WithYear(2024).WithLevel(1).Provide();
+        var lines = text.Split("\n");
+        Assert.Equal("39472   15292", lines[0]);
+        Assert.Equal("18560   15292", lines[999]);
+    }
+}