Create DuckDuckGoPlugin.php

[communitysteps]

DuckDuckGo Search Privacy offers the key features you expect from a search engine, but unlike other search engines, it never tracks you. https://duckduckgo.com/duckduckgo-help-pages/search-privacy/

DuckDuckGo supports search syntax you can use to fine-tune your queries. https://duckduckgo.com/duckduckgo-help-pages/results/syntax/

[JustCarmen]

Thanks!