Lucene.Net.sln: Added .editorconfig-checker.json, .gitattributes, and .gitignore files to Solution Items

Author: NightOwl888

Lucene.Net.sln

@@ -32,6 +32,9 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 	ProjectSection(SolutionItems) = preProject
 		.asf.yaml = .asf.yaml
 		.editorconfig = .editorconfig
+		.editorconfig-checker.json = .editorconfig-checker.json
+		.gitattributes = .gitattributes
+		.gitignore = .gitignore
 		.rat-excludes = .rat-excludes
 		CHANGES.txt = CHANGES.txt
 		CONTRIBUTING.md = CONTRIBUTING.md