[enh] initial structure

docs/user/search_syntax.rst

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+Search syntax
+=============
+
+Searx allows you to modify the default categories, engines and search
+language via the search query.
+
+Category/engine prefix: ``!``
+
+Language prefix: ``:``
+
+Prefix to add engines and categories to the currently selected
+categories: ``?``
+
+Abbrevations of the engines and languages are also accepted.
+Engine/category modifiers are chainable and inclusive (e.g. with
+`!it !ddg !wp qwer <https://searx.me/?q=%21it%20%21ddg%20%21wp%20qwer>`_
+search in IT category **and** duckduckgo **and** wikipedia for ``qwer``).
+
+See the `/preferences page <https://searx.me/preferences>`_ for the
+list of engines, categories and languages.
+
+Examples
+~~~~~~~~
+
+Search in wikipedia for ``qwer``:
+`!wp qwer <https://searx.me/?q=%21wp%20qwer>`__ or
+`!wikipedia qwer <https://searx.me/?q=%21wikipedia%20qwer>`_
+
+Image search:
+`!images Cthulhu <https://searx.me/?q=%21images%20Cthulhu>`_
+
+Custom language in wikipedia:
+`:hu !wp hackerspace <https://searx.me/?q=%3Ahu%20%21wp%20hackerspace>`_