Add READMEs for several modules

modules/ui/doom-dashboard/README.org

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+#+TITLE: :ui doom-dashboard
+
+This module gives Doom Emacs a dashboard buffer.
+
+It is loosely inspired by Atom's dashboard.
+
+* Table of Contents :TOC:
+- [[#install][Install]]
+- [[#keybindings][Keybindings]]
+- [[#customization][Customization]]
+
+* Install
+This module only requires that ~all-the-icons~'s icon fonts are installed. Use ~M-x all-the-icons-install-fonts~ to do so.
+
+* Keybindings
+
+* Customization

modules/ui/doom-quit/README.org

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+#+TITLE: :ui doom-quit
+
+Remember these?
+
+[[http://cf.geekdo-images.com/images/pic969210_md.jpg]]
+
+Yeah.

modules/ui/hl-todo/README.org

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+#+TITLE: :ui hl-todo
+
+This module adds syntax highlighting for TODO/FIXME/NOTE tags in programming major-modes.
+
+What keywords are highlighted (and their color) can be customized through ~hl-todo-keyword-faces~.
+
+#+BEGIN_SRC emacs-lisp
+;; the default
+(setq hl-todo-keyword-faces
+      `(("TODO"  . ,(face-foreground 'warning))
+        ("FIXME" . ,(face-foreground 'error))
+        ("NOTE"  . ,(face-foreground 'success))))
+#+END_SRC

modules/ui/tabbar/README.org

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+#+TITLE: :ui tabbar
+
+This module adds a tabbar to the Emacs UI.
+
+I don't recommend you use this module. It is here for reference, is unstable and doesn't integrate with Doom's UI well. I find ivy, helm or even ~buffer-menu~ to be better suited for buffer management.

modules/ui/unicode/README.org

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+#+TITLE: :ui unicode
+
+This unicode extends Doom's ability to display non-English unicode.
+
+This is for non-English Emacs users, for whom Doom's built-in unicode support in insufficient.
+
+When this module is enabled...
+
++ The first time you run Emacs a unicode cache will be generated -- this will take a while!
++ Doom will ignore the ~doom-unicode-font~ variable and the ~:unicode-font~ setting.