chore: add npm keywords for angular (#1015)

<!-- Please use this template for your pull request. -->
<!-- Please use the sections that you need and delete other sections -->

## This PR
<!-- add the description of the PR here -->

- adds keywords for angular

Signed-off-by: Lukas Reining <[email protected]>

Author: lukas-reining

Diff for: packages/angular/projects/angular-sdk/package.json

@@ -20,5 +20,14 @@
     "@angular/common": "^17.3.0",
     "@angular/core": "^17.3.0"
   },
-  "sideEffects": false
+  "sideEffects": false,
+  "keywords": [
+    "openfeature",
+    "feature",
+    "flags",
+    "toggles",
+    "browser",
+    "web",
+    "angular"
+  ]
 }