[DEV] Update doc

[plutonik-a]

When building hsg-project and following the described steps in the Readme, there is one step missing in the documentation for installing S3 Helper, which is documented only in the S3 Repo's readme.

Including this step in an automation could also be helpful. Possibly by providing a local.build.properties.example file with a description of inserting credentials and including copying and renaming the module as an ant task.