implement level1 and level2

Level1/Level1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../Common/Common.csproj" />
+  </ItemGroup>
+
+</Project>

Level1/Level1Solver.cs

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+namespace AoC24;
+
+using AoC24.Common;
+using AoCLevelInputProvider;
+using Parsing;
+using Parsing.Schema;
+
+public class Level1Solver : LevelSolverBase
+{
+    public override int LevelNumber
+    {
+        get { return 1; }
+    }
+
+    protected override InputSchemaBuilder DefineInputSchema(InputSchemaBuilder schemaBuilder)
+    {
+        return schemaBuilder
+                    .Repeat(2)
+                        .Expect(InputType.Integer)
+                    .EndRepetition();
+    }
+
+    public override string SolveFirstStar()
+    {
+        var data = this.GetData()
+                       .AsListColumns<int>();
+
+        var sortedLeftColumn = data[0];
+        sortedLeftColumn.Sort();
+        var sortedRightColumn = data[1];
+        sortedRightColumn.Sort();
+
+        var sumDifferences = 0;
+
+        for (var i = 0; i < sortedLeftColumn.Count; i++)
+        {
+            sumDifferences += Math.Abs(sortedLeftColumn[i]-sortedRightColumn[i]);
+        }
+
+        return sumDifferences.ToString();
+    }
+
+    public override string SolveSecondStar()
+    {
+        var data = this.GetData()
+                       .AsListColumns<int>();
+
+        var uniqueLeftColumn = data[0].Distinct();
+        var rightColumn = data[1];
+        
+        Dictionary<int, int> numInstances = new Dictionary<int, int>();
+        foreach(var value in uniqueLeftColumn)
+        {
+            numInstances[value] = 0;
+        }
+
+        foreach(var value in rightColumn)
+        {
+            if (numInstances.ContainsKey(value))
+            {
+                numInstances[value] = numInstances[value] + 1;
+            }
+        }
+
+        var sumScore = 0;
+
+        foreach(var key in numInstances.Keys)
+        {
+            sumScore = sumScore + numInstances[key] * key;
+        }
+
+        return sumScore.ToString();
+    }
+}

Level1/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using AoC24;
+
+var levelSolver = new Level1Solver();
+var solution1 = levelSolver.SolveFirstStar();
+var solution2 = levelSolver.SolveSecondStar();
+
+if (!string.IsNullOrEmpty(solution1))
+{
+    Console.WriteLine("Solution for example 1 is: " + solution1);
+}
+else
+{
+    Console.WriteLine("Example 1 has not been solved yet!");
+}
+if (!string.IsNullOrEmpty(solution2))
+{
+    Console.WriteLine("Solution for example 2 is: " + solution2);
+}
+else
+{
+    Console.WriteLine("Example 2 has not been solved yet!");
+}