Move move .emacs.d out of configs/shared

Moving all of my Emacs-related files into their own directory at the root of
this repository.

emacs/.emacs.d/wpc/polymorphism.el

@@ -0,0 +1,37 @@
+;;; polymorphism.el --- Sketching my ideas for polymorphism in Elisp -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Once again: modelled after Elixir.
+
+;;; Code:
+
+;; More sketches of Elisp polymorphism initiative.
+;;
+;; Two macros:
+;; - `defprotocol'
+;; - `definstance'
+;;
+;; Is it just a coincidence that these two macros have the same number of
+;;characters or is that fate?  I say fate.
+;;
+;; (defprotocol monoid
+;;   :functions (empty concat))
+;;
+;; (definstance monoid vector
+;;   :empty
+;;   (lambda () [])
+;;   :concat
+;;   #'vector/concat)
+;;
+;; More sketching...
+;; (defun monoid/empty ()
+;;   "Sketch."
+;;   (funcall #'(,(monoid/classify)/empty)))
+;; (defun monoid/concat (xs)
+;;   "Sketch."
+;;   (apply #'(,(monoid/classify)/concat) args))
+
+
+(provide 'polymorphism)
+;;; polymorphism.el ends here