[VisualStudio] Add rule for ScaffoldingReadMe.txt (#3328)

VisualStudio.gitignore

@@ -61,6 +61,9 @@ project.lock.json
 project.fragment.lock.json
 artifacts/
 
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
 # StyleCop
 StyleCopReport.xml