fix: add ng-lightning metadata (#139)

Author: jdegand

metadata.json

@@ -161,6 +161,12 @@
  "license": "MIT",
  "name": "ngAarhus"
  },
+ "ng-lightning": {
+ "name": "ng-lightning",
+ "license": "MIT",
+ "creator": "Tasos Bekos",
+ "website": "https://ng-lightning.github.io/ng-lightning/#/"
+ },
  "ng-morocco.svg": {
  "creator": "Ouadie Lahdioui",
  "description": "Logo of The Moroccan Angular Developer Community",