Add more private search engines to the list

Added: 
- DuckDuckGo
- Swisscows
- Disconnect Search
- MetaGer

README.md

@@ -678,6 +678,10 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://searx.me/"><b>searX</b></a> - a privacy-respecting, hackable metasearch engine.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://darksearch.io/"><b>darksearch</b></a> - the 1st real Dark Web search engine.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.qwant.com/"><b>Qwant</b></a> - the search engine that respects your privacy.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://duckduckgo.com/"><b>DuckDuckGo</b></a> - the search engine that doesn't track you.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://swisscows.com/"><b>Swisscows</b></a> - privacy safe web search<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://search.disconnect.me/"><b>Disconnect Search</b></a> - the search engine that anonymizes your searches.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://metager.org/"><b>MetaGer</b></a> - the search engine that uses anonymous proxy and hidden Tor branches.<br>
 </p>
 
 ##### :black_small_square: Secure Webmail Providers