Create topic, subscription and handle messages using cloud console interface GCP , Basics of Pubsub

Summary of Steps:
Create Topic: gcloud pubsub topics create my-topic
Create Subscription: gcloud pubsub subscriptions create my-subscription --topic=my-topic
Publish Messages: gcloud pubsub topics publish my-topic --message="Message content"
Pull Messages: gcloud pubsub subscriptions pull my-subscription --limit=1
Handle Messages Programmatically using a client library.
Clean Up: Delete the topic and subscription after the demo.