Create README.md

Author: jyoti1998-gehlot

beginners/aws/modules/API_Gateway & CloudWatch/README.md

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+ ## API_Gateway & Cloudwatch
+
+These templates implements a api_gateway, cloudwatch alarm, dashboard and route53 health check, and associated necessary steps required. We used below services :
+
+- API_Gateway
+- cloudwatch_dashboard for api
+- route53 health check
+
+-- Mention your region, secret and access keys, vpc_id, subnet_ids and ami_id required in the templates.
+
+To run these templates, clone the repository and run terraform apply within its own directory.
+
+For example:
+
+```tf
+$ git clone https://github.com/collabnix/terraform.git
+$ cd terraform/beginner/aws/modules/API_Gateway & CloudWatch
+$ terraform apply
+```