Added 'dotenv-mode'

An Emacs mode for .env files that includes the following features

modules/init-dotenv.el

@@ -0,0 +1,12 @@
+;;; init-dotenv.el --- .Emacs Configuration -*- lexical-binding: t -*-
+;;; Commentary:
+;;
+
+;;; Code:
+;; dotenv-mode
+(use-package dotenv-mode
+  :pin "MELPA"
+  :mode ("\\.env\\'" . dotenv-mode))
+
+(provide 'init-dotenv)
+;;; init-dotenv.el ends here