.gitignore - minor update for JetBrains Rider

Author: andriibratanin

.gitignore

@@ -60,3 +60,6 @@ nunit-*.xml
 !nuget/bouncycastle.crypto.dll.1.8.1.nupkg
 !nuget/microsoft.netframework.referenceassemblies.net40.1.0.3.nupkg
 !nuget/thoughtworks.qrcode.1.1.0.nupkg
+
+.idea
+*.DotSettings.user