chore: add npm keywords for angular (#1015)

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## This PR
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- adds keywords for angular

Signed-off-by: Lukas Reining <lukas.reining@codecentric.de>

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"
+  ]
 }