fix: Add license to package.json (#1052)

Co-authored-by: Remco van Herk <remco.vanherk@propertyplan.nl>

Author: TheMrBooyah

package.json

@@ -19,6 +19,7 @@
     "type": "git",
     "url": "https://github.com/scttcper/ngx-toastr"
   },
+  "license": "MIT",
   "dependencies": {
     "@angular/common": "^21.1.0",
     "@angular/compiler": "^21.1.0",

projects/ngx-toastr/package.json

@@ -1,6 +1,7 @@
 {
   "name": "ngx-toastr",
   "version": "0.0.1",
+  "license": "MIT",
   "peerDependencies": {
     "@angular/common": "^21.0.0",
     "@angular/core": "^21.0.0",