add missing stylecop.json

.gitignore

@@ -158,7 +158,6 @@ AppPackages/
 # Others
 *.[Cc]ache
 ClientBin/
-[Ss]tyle[Cc]op.*
 ~$*
 *~
 *.dbmdl

stylecop.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://raw.githubusercontent.com/DotNetAnalyzers/StyleCopAnalyzers/master/StyleCop.Analyzers/StyleCop.Analyzers/Settings/stylecop.schema.json",
+  "settings": {
+    "orderingRules": {
+      "usingDirectivesPlacement": "outsideNamespace",
+      "elementOrder": [
+        "kind"
+      ]
+    },
+    "documentationRules": {
+      "xmlHeader": false,
+      "documentInternalElements": false,
+      "copyrightText": "Copyright (c) Six Labors and contributors.\nLicensed under the Apache License, Version 2.0."
+    }
+  }
+}