feat: add keywords to package.json for better discoverability

Author: HomelessCoder

projects/ng-beacon/package.json

@@ -1,6 +1,20 @@
 {
     "name": "ng-beacon",
     "version": "0.0.1",
+    "keywords": [
+        "angular",
+        "tour",
+        "guided-tour",
+        "onboarding",
+        "spotlight",
+        "overlay",
+        "beacon",
+        "signals",
+        "zoneless",
+        "angular19",
+        "angular20",
+        "angular21"
+    ],
     "peerDependencies": {
         "@angular/common": "^19.2.0",
         "@angular/core": "^19.2.0"