Add AoC 2025 project structure and first solutions

AoC_2025.Tests/Day03Test.cs

@@ -0,0 +1,46 @@
+using AdvenOfCode.Contracts;
+
+namespace AoC_2025.Tests;
+
+public class Day03Test
+{
+    private readonly IPuzzleSolver<long> _sut;
+    private const string TestInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Test\day03.txt";
+    private const string ProdInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Prod\day03.txt";
+    
+    public Day03Test()
+    {
+        _sut = new Day03();
+    }
+    [Fact]
+    public void Part01_Test_equals_357()
+    {
+        var actual = _sut.SolvePart1(TestInputPath);
+        
+        Assert.Equal(357, actual);
+    }
+    
+    [Fact]
+    public void Part01_Prod_equals_16812()
+    {
+        var actual = _sut.SolvePart1(ProdInputPath);
+        
+        Assert.Equal(16812, actual);
+    }
+    
+    [Fact]
+    public void Part02_Test_equals_3121910778619()
+    {
+        var actual = _sut.SolvePart2(TestInputPath);
+        
+        Assert.Equal(3121910778619, actual);
+    }
+    
+    [Fact]
+    public void Part02_Prod_equals_166345822896410()
+    {
+        var actual = _sut.SolvePart2(ProdInputPath);
+        
+        Assert.Equal(166345822896410, actual);
+    }
+}