Added Spring Boot Zip example

examples/springboot-zip/.gitignore

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+HELP.md
+target/
+!app/.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+.mvn
+.aws-sam

examples/springboot-zip/README.md

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+# Spring Boot 2 Zip example
+
+A basic pet store application written with the Spring Boot 2 framework. You can build and test it locally as a typical Spring Boot 2 application.
+
+The application can be deployed in an AWS account using the [Serverless Application Model](https://github.com/awslabs/serverless-application-model). The `template.yaml` file in the root folder contains the application definition.
+
+To run the application we are using the run.sh script located in the resources folder:
+
+```shell
+#!/bin/sh
+
+java -cp "./:lib/*" "-XX:TieredStopAtLevel=1" "com.amazonaws.demo.petstore.Application"
+```
+
+In the configuration we have to specify the AWS Lambda adapter as a layer and configure the script as handler:
+
+```yaml
+ Properties:
+      MemorySize: 2048
+      Handler: run.sh
+      CodeUri: app/
+      Runtime: java11
+      Environment:
+        Variables:
+          RUST_LOG: info
+          READINESS_CHECK_PATH: /healthz
+          REMOVE_BASE_PATH: /v1
+          AWS_LAMBDA_EXEC_WRAPPER: /opt/bootstrap
+      Layers:
+        - !Sub arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerX86:2
+```
+### Remove the base path
+
+The pet store application is deployed under /v1/{proxy+}. But the application does not know that. So in the SAM template file, we configured environment variable `REMOVE_BASE_PATH=/v1`. 
+This configuration tells the Adapter to remove `/v1` from http request path, so that the pet store application works without changing code. 
+
+
+## Pre-requisites
+
+The following tools should be installed and configured.
+
+* [AWS CLI](https://aws.amazon.com/cli/)
+* [SAM CLI](https://github.com/awslabs/aws-sam-cli)
+* [Maven](https://maven.apache.org/)
+* [Docker](https://www.docker.com/products/docker-desktop)
+
+## Deploy to Lambda
+Navigate to the sample's folder and use the SAM CLI to build the application:
+
+```shell
+$ sam build
+```
+
+This command compiles the application and prepares a deployment package in the `.aws-sam` sub-directory.
+
+To deploy the application in your AWS account, you can use the SAM CLI's guided deployment process and follow the instructions on the screen
+
+```shell
+$ sam deploy --guided
+```
+
+Once the deployment is completed, the SAM CLI will print out the stack's outputs, including the new application URL. You can use `curl` or a web browser to make a call to the URL
+
+```shell
+...
+---------------------------------------------------------------------------------------------------------
+OutputKey-Description                        OutputValue
+---------------------------------------------------------------------------------------------------------
+PetStoreApi - URL for application            https://xxxxxxxxxx.execute-api.us-west-2.amazonaws.com/v1/pets
+---------------------------------------------------------------------------------------------------------
+...
+
+$ curl https://xxxxxxxxxx.execute-api.us-west-2.amazonaws.com/v1/pets
+```
+
+## Clean up
+
+This example use provisioned concurrency to reduce cold start time. It incurs additional cost. You can remove the whole example with the following command. 
+
+```shell
+sam delete
+```