Feature request: Have a documentaton for each SAM template

### Describe your idea/feature/enhancement

I which AWS SAM CLI Application Templates would have an explanation of every template that is presented when using the AWS SAM CLI command 'sam init'.

The template are the following:
1 - Hello World Example
2 - Data processing
3 - Hello World Example With Powertools
...
14 - Machine Learning

### Proposal

For each template, it have:
- a brief description
- a list of deployed components in AWS
- a diagram of deployed component in AWS

### Additional Details

Start by running the AWS SAM CLI `sam init` flow and reviewing the listed application templates, including Hello World, Data processing, Powertools, and Machine Learning. Document each template's purpose, deployed AWS components, and architecture diagram; done means every presented template has all three items.

Written by the indexing model from the issue text.