Add some info on theming

src/theming.md

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+---
+title: Theming
+show_in_menu: contents
+nav_sort: 30
+---
+
+# Theming
+
+**Mibew Messenger** provides an ability to heavily alter its look'n'feel in a
+number of ways. Here is the list of parts that can be themed:
+
+* [Chat button](#chat-button).
+* [Chat window](#chat-window).
+* [Invitation to chat](#invitation).
+* [Administrative interface](#interface).
+
+## <a name="chat-button"></a>Theming chat button
+
+Graphical chat buttons could have different outlook depending on their style
+that could be specified during the process of button code generation.
+
+Usually the button contains some text, that's why button styles considered to
+be tied to localization. So appropriate images should be placed in the
+directory of a locale, i.e. in `locales/<2-letter code>/button/`.
+
+The name of a button image has a special format:
+`<name of the style>_<button state>.<extension>`, where `<button state>` should
+be either _'on'_ (for an image that is shown if there are operators ready to
+chat) or _'off'_ (for an image that is shown if there are no free operators),
+and `<extension>` should be either _'gif'_ or _'png'_.
+
+If there are images for both states of a button, the appropriate style will be
+automatically available for the related locale in the button generation form.
+
+## <a name="chat-window"></a>Theming chat window
+
+Styles for the chat window are stored in `styles/chats/` directory, with each
+style in its own subdirectory. For example, the style named _'default'_ is
+stored in `styles/chats/default/` directory.
+
+**Mibew Messenger** automatically scans the styles directory, so new chat
+styles becomes available in the button generation form and at the _'Settings'_
+page immediately after addition.
+
+Here is the description of files and directories that are used in the
+_'default'_ style (which is, obviously, the default style for chat windows in
+**Mibew Messenger**):
+
+* `chat.css`: the main CSS file of the style. Connected in
+  `src/mibew/styles/chats/default/templates_src/server_side/_layout.handlebars`.
+* `chat_ie7.css`: additional CSS file that is used only in IE7. Connected in
+  `src/mibew/styles/chats/default/templates_src/server_side/chat.handlebars`.
+* `config.yml`: style configuration. Contains information about the style and
+  its options.
+* `iframe.css`: CSS file used to customize the chat popup. Its name and path
+  are specified in `config.yml`.
+* `images/`: directory containing all images used in CSS files and in the
+  markup of style templates.
+* `js/source/`: directory containing raw JavaScript files used in the style.
+* `js/compiled/scripts.js`: compiled, minified and merged JavaScript files.
+  Connected in `styles/chats/default/templates_src/server_side/chat.handlebars`.
+* `screenshots/`: directory containing previews for the style.
+* `templates_src/server_side/`: directory containing Handlebars templates to
+  be rendered at the **Server** side.
+* `templates_src/client_side/`: directory contanining raw Handlebars.js
+  templates to be rendered at the **Client** side.
+* `templates_compiled/cliend_side/templates.js`: compiled and merged
+  Handlebars.js templates to be used at the **Client** side.
+
+The style needs to be built (with its JavaScripts and templates compiled)
+before use. See `src/gulpfile.js` (`chat-styles`,
+`chat-styles-handlebars`, `chat-styles-js` tasks) for more info.
+
+If one needs to create a custom style, it is possible to copy the default
+style and use it as a starting point. But one should be aware that probably
+it will be neccessary to alter the Gulp tasks mentioned above.
+
+## <a name="invitation"></a>Theming invitation
+
+Styles for invitations are stored in `styles/invitations/` directory, with each
+style in its own subdirectory. For example, the style named _'default'_ is
+stored in `styles/invitations/default/` directory.
+
+**Mibew Messenger** automatically scans the styles directory, so new invitation
+styles becomes available in the button generation form and at the _'Settings'_
+page immediately after addition.
+
+Here is the description of files and directories that are used in the
+_'default'_ style (which is, obviously, the default style for invitations in
+**Mibew Messenger**):
+
+* `24x24.png`: image, used in `invite.css`.
+* `close.gif`: image, used in `invite.css`.
+* `config.yml`: style configuration. Contains information about the style and
+  its options.
+* `invite.css`: CSS file defining the outlook of the invitation popup.
+* `screenshots/`: directory containing previews for the style.
+
+If one needs to create a custom invitation style, it is possible to copy the
+default style and use it as a starting point.
+
+## <a name="interface"></a>Theming administrative interface
+
+Styles for the administrative interface of **Mibew Messenger** are stored in
+`styles/pages/` directory, with each style in its own subdirectory.
+For example, the style named _'default'_ is stored in `styles/pages/default/`
+directory.
+
+**Mibew Messenger** automatically scans the styles directory, so new interface
+styles becomes available at the _'Settings'_ page immediately after addition.
+
+Here is the description of files and directories that are used in the
+_'default'_ style (which is, obviously, the default style for the
+administrative interface of **Mibew Messenger**):
+
+* `config.yml`: style configuration. Contains information about the style and
+  its options.
+* `css/`: directory containing CSS files of the style.
+* `images`: directory containing images used in CSS files and in the markup
+  of style templates.
+* `js/`: directory containing JavaScripts connected in the markup of style
+  templates.
+* `screenshots/`: directory containing previews for the style.
+* `templates_src/server_side/`: directory containing Handlebars templates to
+  be rendered at the **Server** side.
+* `templates_src/client_side/`: directory contanining raw Handlebars.js
+  templates to be rendered at the **Client** side.
+* `templates_compiled/cliend_side/templates.js`: compiled and merged
+  Handlebars.js templates to be used at the **Client** side.
+
+The style needs to be built (with its templates compiled) before use.
+See `src/gulpfile.js` (`page-styles` task) for more info.
+
+If one needs to create a custom style, it is possible to copy the default
+style and use it as a starting point. But one should be aware that probably
+it will be neccessary to alter the Gulp task mentioned above.