CI/CD Support.

[DevX86]

I've initiated a pull request, which you can find at https://github.com/kelvins/geocoder/pull/5. This PR is designed to integrate CI/CD support, as well as enrich the Result struct with an ErrorMessage for enhanced error reporting.

In this process, I've made a conscious effort to preserve backward compatibility, adhere to the existing code style, and prevent any disruptions through breaking changes. I'm looking forward to your thoughts and feedback!

I noticed that the term GeocodeApiUrl might benefit from a slight adjustment to ApiUrl to better align with the naming convention exhibited in ApiKey. However, I've opted to retain the current name out of respect for potential intentional naming schemes. Please do let me know if you'd prefer modifications, I'd be more than happy to make those adjustments for you!