add doc reference to cookiecutter-aws-sam-powertools-java (#204)

Author: vitodegiosa

docs/content/index.mdx

@@ -106,6 +106,14 @@ dependencies {
 Please add `aspectjVersion = '1.9.6'` to the `gradle.properties` file. The aspectj plugin works at the moment with gradle 5.x only if
 you are using `java 8` as runtime. Please refer to [open issue](https://github.com/awslabs/aws-lambda-powertools-java/issues/146) for more details.
 
+**Quick hello world examples using SAM CLI**
+You can use [SAM](https://aws.amazon.com/serverless/sam/) to quickly setup a serverless project including AWS Lambda Powertools Java.
+
+```bash:title=hello_world.sh
+sam init --location gh:aws-samples/cookiecutter-aws-sam-powertools-java
+```
+For more information about the project and available options refer to this [repository](https://github.com/aws-samples/cookiecutter-aws-sam-powertools-java/blob/main/README.md)
+
 ## Environment variables
 
 **Environment variables** used across suite of utilities.