Add READMEs for several modules

modules/feature/snippets/README.org

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+#+TITLE: :feature snippets
+
+This module adds snippets to Emacs, powered by yasnippet.
+
+* Table of Contents :TOC:
+- [[#install][Install]]
+
+* Install
+There are no extra dependencies for this module.
+
+By default, this module uses the snippet library included with yasnippet.
+
+For the best experience, I'd suggest installing mine from https://github.com/hlissner/emacs-snippets -- they have been tailored specifically for Doom.
+
+1. Clone the repo to your private module:
+   #+BEGIN_SRC bash
+   git clone https://github.com/hlissner/emacs-snippets ~/.emacs.d/modules/private/$(whoami)/snippets
+   #+END_SRC
+2. Tell yasnippet where to look for them:
+   #+BEGIN_SRC emacs-lisp
+   ;; modules/private/{USERNAME}/config.el
+   (after! yasnippet
+     (setq yas-snippet-dirs
+           (append (list (expand-file-name "snippets/" (file-name-directory load-file-name)))
+                   (delq 'yas-installed-snippets-dir yas-snippet-dirs))))
+   #+END_SRC
+