Добавьте файлы проекта.

CRAWLER.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 18
+VisualStudioVersion = 18.4.11626.88 stable
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CRAWLER", "CRAWLER.csproj", "{99A6FD50-529F-431C-8F74-7F37BBA2948E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{99A6FD50-529F-431C-8F74-7F37BBA2948E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{99A6FD50-529F-431C-8F74-7F37BBA2948E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{99A6FD50-529F-431C-8F74-7F37BBA2948E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{99A6FD50-529F-431C-8F74-7F37BBA2948E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {607CB39E-759D-4950-B3DE-F3008151509A}
+	EndGlobalSection
+EndGlobal