chore: Added .npmrc

[breautek]

Platforms affected

Development Environment

Motivation and Context

Progresses apache/cordova#299

Description

Adds a npmrc config file to the repo which the registry explicitly set to ensure that the official NPM registry is used, particularly for those who may have an alternate NPM registry set.

Testing

Ran npm test

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary