CB-6491 add CONTRIBUTING.md
CB-4602 CB-6490 CB-4822 WP Globalization

BCP-47 compliance for getLocaleName, getPreferredLanguage.
CB-4602 Added clarification to docs
Merge branch 'CB-4602wp' of https://github.com/stacic/cordova-plugin-globalization
clean up pull request. this closes #11
CB-6805 Add license
CB-6127 Spanish and French Translations added. Github close #7
CB-6877 Updated version and RELEASENOTES.md for release 0.2.8
CB-6877 Incremented plugin version.
CB-4602 geolocation.getPreferredLanguage and geolocation.getLocaleName now return strings with hypen (-) to stay compliant with current standards