Initial Release

- Add new secrets management library (#1)

ADD: Libraries/dsl.rb to manage secrets
ADD: Test cookbook in tests/fixtures/
ADD: Maintainers.md
UPDATE: README.md
UPDATE: Berksfile to include test cookbook
UPDATE: Gemfile to install 'vault-ruby' gem locally
UPDATE: Metadata to include dependency on chef-vault and gem 'vault'
UPDATE: README.md
ADD: CHANGELOG.md, CONTRIBUTORS.md and MIT LICENSE file
BUMP: Version 1.0.0