Adding initial directories for push to file

[rpothier]

What does this PR do?

This lays out the initial file structure for push to file.

What ticket does this PR close?

Resolves #342

Checklists

Change log

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a CHANGELOG update

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• This PR includes new unit and integration tests to go with the code changes, or
• The changes in this PR do not require tests

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• Docs (e.g. READMEs) were updated in this PR, and/or there is a follow-on issue to update docs, or
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[codeclimate]

Code Climate has analyzed commit d79055e and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 87.5% (0.0% change).

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[diverdane]

Thanks for getting the ball rolling on this project structure!
I think what we can do to get this merged as a placeholder is:

• Create two new directories for packages:
  • pkg/secrets/push_to_file
  • pkg/secrets/annotations
• Since GitHub won't allow us to merge empty directories, either temporarily add an empty .keep file into each directory (see https://stackoverflow.com/questions/115983/how-can-i-add-a-blank-directory-to-a-git-repository), or add temporary README.md files in each, saying e.g.:

This directory will be used to define a package for the Secrets Provider "Push to File" functionality. It will contain source code to do the following:

• Parse the keys used in push-to-file annotations (e.g. sort annotations based on secrets group)
• Retrieve Conjur secrets for each secrets group and write retrieved values to a file info data struct
• Write secrets files to a shared volume

...and...

This directory will be used to define a package that provides generic parsing of Annotations files that have been created by Kubernetes via the Kubernetes Downward API. This package will read in files that contain entries of the form <key>=<value>, and will create a Golang map of the form map[string]string.

[diverdane]

LGTM!