Add readme.

Author: jcs090218

README.md

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+[![Build Status](https://travis-ci.com/jcs090218/goto-line-preview.svg?branch=master)](https://travis-ci.com/jcs090218/goto-line-preview)
+[![MELPA](https://melpa.org/packages/dashboard-current-badge.svg)](https://melpa.org/#/dashboard-current)
+[![MELPA Stable](https://stable.melpa.org/packages/dashboard-current-badge.svg)](https://stable.melpa.org/#/dashboard-current)
+[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+
+
+# dashboard-current
+> Show files and directories in current directory.