Initial commit

1. Two Sum/1. Two Sum.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_1._Two_Sum</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

1. Two Sum/Program.cs

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+namespace _1._Two_Sum
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+        }
+    }
+}

1. Two Sum/Solution.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _1._Two_Sum;
+
+public class Solution
+{
+    public int[]? TwoSum(int[] nums, int target)
+    {
+        for (int i = 0; i < nums.Length; i++)
+            for (int j = i+1; j < nums.Length; j++)
+                if (nums[i] + nums[j] == target)
+                    return new int[] { i, j };
+        return null;
+    }
+}