Added deployments README

Author: anjanvb

sample_deployments/README.md

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+### Sample Lambda deplpoyments with Rhubarb
+
+Here you will find some sample Lambda deployments with Rhubarb using CDK.
+
+1. [Docker Deployment](./cdk_lambda_docker/) - Deploys a Lambda function with a Docker image with Rhubarb dependencies
+2. [Native Deployment](./cdk_lambda_native/) - Deploys a Lambda function code with Rhubarb as a Lambda Layer (note that the deployment is for x86 Lambda environment)