add lisp packages

lisp/yasnippet-snippets/snippets/emacs-lisp-mode/dired.process_marked

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+# -*- mode: snippet -*-
+# name: process marked files in dired
+# contributor : Xah Lee
+# --
+;; idiom for processing a list of files in dired's marked files
+
+;; suppose myProcessFile is your function that takes a file path
+;; and do some processing on the file
+
+(defun dired-myProcessFile ()
+  "apply myProcessFile function to marked files in dired."
+  (interactive)
+  (require 'dired)
+  (mapc 'myProcessFile (dired-get-marked-files))
+)
+
+;; to use it, type M-x dired-myProcessFile