Update SAM template with adding AWS Lambda Layer

Author: EC2 Default User

README.md

@@ -5,3 +5,9 @@
 # About lambda-node-canvas
 
 lambda-node-canvas is an implementation of node-canvas for manipulating vector graphics on AWS Lambda, with using AWS Lambda Layer to manage the dependency with node-canvas in order to enable inline editing of the function code.
+
+## Getting started
+
+To use lambda-node-canvas, please visit [application page](https://serverlessrepo.aws.amazon.com/applications/arn:aws:serverlessrepo:us-east-1:990551184979:applications~cairo-canvas-nodejs) on [AWS Serverless Application Repository](https://aws.amazon.com/serverless/serverlessrepo/), then deploy the serverless application using the **Deploy** button on the page.
+
+The deployment of the serverless application may take a few minutes, once the application is deployed and ready, the code of the *Function* could be edited using inline code editor in AWS Lambda console.