SAM README file has incorrect information

When a serverless application is created, the README file mentions that an `events` folder is created:

> - events - Invocation events that you can use to invoke the function.

However, this folder is not created.

Search the repository for the README text containing “events - Invocation events that you can use to invoke the function.” Compare that description with the files actually created for a serverless application, then update the README so it matches the generated structure and verify that no other template documentation repeats the incorrect information.

Written by the indexing model from the issue text.