onionsearch: add page (#14130)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/onionsearch.md

@@ -0,0 +1,25 @@
+# onionsearch
+
+> Scrape URLs on different `.onion` search engines.
+> Note: `onionsearch` requires a Tor proxy running on `localhost:9050`; a Tor enabled browser is needed to visit the `.onion` websites.
+> More information: <https://github.com/megadose/OnionSearch>.
+
+- Request results from all the search engines:
+
+`onionsearch "{{string}}"`
+
+- Request search results from specific search engines:
+
+`onionsearch "{{string}}" --engines {{tor66 deeplink phobos ...}}`
+
+- Exclude certain search engines when searching:
+
+`onionsearch "{{string}}" --exclude {{candle ahmia ...}}`
+
+- Limit the number of pages to load per engine:
+
+`onionsearch "{{stuxnet}}" --engines {{tor66 deeplink phobos ...}} --limit {{3}}`
+
+- List all supported search engines:
+
+`onionsearch --help | grep -A1 -i "supported engines"`