Add root items to solution

Author: Mads Dabros

SharpLearning.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.26730.3
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SharpLearning.InputOutput.Test", "src\SharpLearning.InputOutput.Test\SharpLearning.InputOutput.Test.csproj", "{9B29211D-9211-4C36-872D-5747D6C51878}"
 EndProject
@@ -55,10 +55,20 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SharpLearning.InputOutput",
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{55C8F585-6918-4373-A349-EDF167D77FBB}"
 	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
+		.gitattributes = .gitattributes
+		.gitignore = .gitignore
+		all.ps1 = all.ps1
 		azure-pipelines.yaml = azure-pipelines.yaml
+		build.cmd = build.cmd
+		clean.ps1 = clean.ps1
 		CONTRIBUTING.md = CONTRIBUTING.md
 		src\Directory.Build.props = src\Directory.Build.props
+		global.json = global.json
+		LICENSE.md = LICENSE.md
 		README.md = README.md
+		restore.ps1 = restore.ps1
+		test.ps1 = test.ps1
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SharpLearning.XGBoost", "src\SharpLearning.XGBoost\SharpLearning.XGBoost.csproj", "{6637B36B-35E2-4FDB-8166-6472307D45BA}"