Add project files.

Szotar/Program.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Szotar
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

Szotar/Szotar.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

SzotarFeladatok.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31624.102
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Szotar", "Szotar\Szotar.csproj", "{8465ADED-61C4-4EB2-A42C-C47B86DC42B5}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8465ADED-61C4-4EB2-A42C-C47B86DC42B5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8465ADED-61C4-4EB2-A42C-C47B86DC42B5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8465ADED-61C4-4EB2-A42C-C47B86DC42B5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8465ADED-61C4-4EB2-A42C-C47B86DC42B5}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {28B1100C-3E6D-4AC9-B3E1-A61E1EA5733E}
+	EndGlobalSection
+EndGlobal