Add package.json, for npm compatibility

[blavenie]

I use angular-image-crop, declared in my package.sjon :

{
  "dependencies": {
    "@bower_components/angular-image-crop": "andyshora/angular-image-crop#v2.0.0",
  }
}

but npm i send an error :

2593 silly fetchPackageMetaData error for @bower_components/angular-image-crop@github:e-is/angular-image-crop#v2.0.0 premature close

This is due to package.json, that is missing