Add hooks documentation

Change-Id: Ief93b34001d327d0691698918e42322a83cc61dd

hooks.md

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+Hooks defined in UniversalLanguageSelector
+==========================================
+
+The hook names are prefixed with mw.uls as a convention.
+
+# List of hooks
+
+## mw.uls.font.change
+
+Fired when the user changes a webfont.
+
+## mw.uls.ime.change
+
+Fired when the user changes the keyboard layout.
+
+## mw.uls.ime.disable
+
+Fired when the user disables keyboard layout support.
+
+## mw.uls.ime.enable
+
+Fired when the user enables keyboard layout support.
+
+## mw.uls.ime.morelanguages
+
+Fired when the user clicks the More languages button in
+the keyboard layout selector.
+
+## mw.uls.interface.language.change
+
+Fired when the user selects a language in the ULS panel.
+
+## mw.uls.interface.morelanguages
+
+Fired when the user clicks the More languages button in
+the Display settings.
+
+## mw.uls.language.revert
+
+Fired when the user reverts the selected language using
+the tooltip that appears after the interface language change.
+
+## mw.uls.login.click
+
+Fired when the user clicks the Log in link in Display settings.
+
+## mw.uls.settings.apply
+
+Fired when the user applies the changed settings.
+
+## mw.uls.settings.cancel
+
+Fired when the user cancels the changes.
+
+## mw.uls.settings.open
+
+Fired when the user opens one of the settings panels.
+
+## mw.uls.webfonts.disable
+
+Fired when the user disables webfonts support.
+
+## mw.uls.webfonts.enable
+
+Fired when the user enables webfonts support.
+
+## mw.uls.webfonts.tofudetected
+
+Fired when ULS detects "tofu".