Feature: Add web push notification permission in frontend (#766)

Add webpush notification permission in frontend

Co-authored-by: Sojan <sojan@pepalo.com>

.env.example

@@ -71,14 +71,14 @@ SENTRY_DSN=
 # Disable if you want to write logs to a file
 RAILS_LOG_TO_STDOUT=true
 LOG_LEVEL=info
-LOG_SIZE=500 
+LOG_SIZE=500
 
 # Credentials to access sidekiq dashboard in production
 SIDEKIQ_AUTH_USERNAME=
 SIDEKIQ_AUTH_PASSWORD=
 
 ### This environment variables are only required if you are setting up social media channels
-#facebook 
+#facebook
 FB_VERIFY_TOKEN=
 FB_APP_SECRET=
 FB_APP_ID=
@@ -101,3 +101,8 @@ CHARGEBEE_API_KEY=
 CHARGEBEE_SITE=
 CHARGEBEE_WEBHOOK_USERNAME=
 CHARGEBEE_WEBHOOK_PASSWORD=
+
+## Push Notification
+## generate a new key value here : https://d3v.one/vapid-key-generator/
+# VAPID_PUBLIC_KEY=
+# VAPID_PRIVATE_KEY=