Create duckduckpost.xml

duckduckpost.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
+<ShortName>DuckDuckPost</ShortName>
+<Description>Search DuckDuckGo using POST requests</Description>
+<InputEncoding>UTF-8</InputEncoding>
+<Image height="16" width="16">https://duckduckgo.com/favicon.ico</Image>
+<Url type="text/html" method="POST" template="https://duckduckgo.com/">
+<Param name="q" value="{searchTerms}"/></Url>
+<Url type="application/x-suggestions+json" method="POST" template="https://duckduckgo.com/ac/">
+<Param name="q" value="{searchTerms}" /><Param name="type" value="list" /></Url>
+</OpenSearchDescription>