added fasd contribution layer

contrib/fasd/README.md

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+# fasd contribution layer for Spacemacs
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(fasd)
+  "List of contribution to load."
+)
+```
+
+This simply adds the fasd-emacs and a single keybinding
+
+## Keybindings
+
+Key Binding         |                 Description
+--------------------|------------------------------------------------------------------
+<kbd>SPC f z</kbd>  | find a file with fasd

contrib/fasd/packages.el

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+(defvar fasd-packages
+  '(
+    fasd
+    ;; package fasds go here
+    )
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defvar fasd-excluded-packages '()
+  "List of packages to exclude.")
+
+(defun fasd/init-fasd ()
+  "initializes fasd-emacs and adds a key binding to <SPC f z>"
+  (use-package fasd
+    :init
+    (progn
+      (global-fasd-mode 1)
+      (evil-leader/set-key "fz" 'fasd-find-file))))
+;; For each package, define a function fasd/init-<package-fasd>
+;;
+;; (defun fasd/init-my-package ()
+;;   "Initialize my package"
+;;   )
+;;
+;; Often the body of an initialize function uses `use-package'
+;; For more info on `use-package', see readme:
+;; https://github.com/jwiegley/use-package