Adding translator for London Gazette

[MylesFTOP]

The London Gazette is the official journal for England and Wales (as well as the rest of the United Kingdom for certain functions), and publishes records of legal, financial, and military matters back to 1665. This translator produces a simple use case for the most common format of article citation.

[AbeJellinek]

@MylesFTOP, wondering if you're still interested in finishing this translator up! I'd love to get it merged.