add info about os-specific dirs to readme - dotfiles - arsenal of config files, ready to be cloned in new (virtual) machines.
  HTML git clone git://git.drkhsh.at/dotfiles.git
   DIR Log
   DIR Files
   DIR Refs
   DIR Submodules
   DIR README
       ---
   DIR commit f5f3aa14e63014e87dfd5d87346f4cedacac2845
   DIR parent e0c8a21da40ed772e8a1c1f77da783c67785675f
  HTML Author: drkhsh <me@drkhsh.at>
       Date:   Sat,  8 Apr 2023 17:50:27 +0200
       
       add info about os-specific dirs to readme
       
       Diffstat:
         M README.md                           |       1 +
       
       1 file changed, 1 insertion(+), 0 deletions(-)
       ---
   DIR diff --git a/README.md b/README.md
       @@ -18,5 +18,6 @@
        
        ## Notes
        
       +- directories starting with an underscore contain os-/distro-specific files
        - `bash`/`fish`/`{,m}ksh`/`zsh` are enhanced by linking common `shell` files