Added Emacs modes for JSON and Markdown

emacs/.emacs.d/lisp/lang/json.el

@@ -0,0 +1,7 @@
+;;; json.el -*- lexical-binding: t -*-
+(use-package json-mode
+  :ensure t)
+
+(provide 'json)
+
+;;; json.el ends here

emacs/.emacs.d/lisp/lang/markdown.el

@@ -0,0 +1,8 @@
+;;; markdown.el -*- lexical-binding: t; -*-
+(use-package markdown-mode
+  :ensure t
+  :mode ("README\\.md\\'" . gfm-mode)
+  :init (setq markdown-command "multimarkdown"))
+
+(provide 'markdown)
+;;; markdown.el ends here