Add .editorconfig file to SolutionItems.

Author: CodingFlow

SimpleChain.sln

@@ -3,7 +3,12 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.9.34902.65
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SimpleChain", "SimpleChain\SimpleChain.csproj", "{0F65EDD3-359B-41D0-B412-5BC4B130AA2A}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SimpleChain", "SimpleChain\SimpleChain.csproj", "{0F65EDD3-359B-41D0-B412-5BC4B130AA2A}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SolutionItems", "SolutionItems", "{1EEA11FA-60E3-480A-87F9-BC4279751185}"
+	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
+	EndProjectSection
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution