Update READMEs & add new ones

modules/ui/doom-modeline/README.org

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+* :ui doom-modeline
+
+This module customizes the Emacs mode-line.
+
+The DOOM modeline was designed for minimalism, and offers:
+
++ A match count panel (for ~evil-search~, ~iedit~ and ~evil-substitute~)
++ An indicator for recording a macro
++ Local python/ruby version in the major-mode
++ A customizable mode-line height (see ~+doom-modeline-height~)
++ An error/warning count segment for flycheck
+
+[[/../screenshots/ml.png]]
+[[/../screenshots/ml-search.png]]
+[[/../screenshots/ml-subst.png]]
+[[/../screenshots/ml-macro.png]]
+[[/../screenshots/ml-version.png]]
+[[/../screenshots/ml-errors.png]]
+
+** Install
+This module requires the fonts included with ~all-the-icons~ to be installed.
+
+Run ~M-x all-the-icons-install-fonts~ to do so.
+
+** Extracting my modeline
+Some might want my modeline without the DOOM config altogether. I've taken some care to make this as easier for you.
+
+Here is what you must do:
+
++ Ensure [[https://github.com/bbatsov/projectile][projectile]] and [[https://github.com/domtronn/all-the-icons.el][all-the-icons]] are installed
++ Ensure ~projectile-mode~ is enabled
++ Ensure the fonts included with ~all-the-icons~ are installed (~M-x all-the-icons-install-fonts~)
++ Replace ~def-package!~ calls with ~use-package~
++ Replace ~doom-project-root~ calls with ~projectile-project-root~
+
+And you /should/ be good to go. As I have never used this out of my config I can't guarantee immediate success, but I'd be happy to help you out. File an issue.
+
+** Troubleshooting
+*** Where are my minor-modes?
+I didn't need it, so I removed it. I wrote ~doom/what-minor-mode~ in the rare case I needed to investigate the currently active minor modes however.