add .gitignore to .sln

Author: Entroper

FF4Editor.sln

@@ -7,6 +7,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FF4Lib", "FF4Lib\FF4Lib.csp
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FF4Editor", "FF4Editor\FF4Editor.csproj", "{9E0B5C9C-6B97-46B3-9C33-5ACED51D5483}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{CCAE9135-56D9-42E1-87A9-7B0272C087E2}"
+	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU