nodePackages.csslint: init at 1.0.2

Add the NPM package `csslint`, at version 1.0.2, as `nodePackages.csslint`.

I have tested this package per nixpkgs manual section 10.1 ("Making patches").

Fixes #18616

pkgs/development/node-packages/node-packages.json

@@ -7,6 +7,7 @@
 , "castnow"
 , "coffee-script"
 , "cordova"
+, "csslint"
 , "dnschain"
 , "docker-registry-server"
 , "elasticdump"