Add Changelog to Visual Studio solution items

Author: manfromarce

src/DocSharp.sln

@@ -16,6 +16,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution items", "Solution
 	ProjectSection(SolutionItems) = preProject
 		..\.editorconfig = ..\.editorconfig
 		..\.gitignore = ..\.gitignore
+		..\CHANGELOG.md = ..\CHANGELOG.md
 		Directory.Build.props = Directory.Build.props
 		..\LICENSE = ..\LICENSE
 		..\LICENSE-Apache = ..\LICENSE-Apache