add README.md

packages/growi-commons/README.md

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+# growi-commons
+
+[![dependencies status](https://david-dm.org/weseek/growi-commons.svg)](https://david-dm.org/weseek/growi-commons)
+[![devDependencies Status](https://david-dm.org/weseek/growi-commons/dev-status.svg)](https://david-dm.org/weseek/growi-commons?type=dev)
+[![MIT License](http://img.shields.io/badge/license-MIT-blue.svg?style=flat)](LICENSE)
+
+[GROWI][growi] Commons Libraries to develop GROWI and plugins
+
+
+Overview
+--------
+
+growi-commons package is includes some functions, classes and modules to develop GROWI substance and GROWI plugins.
+
+Install
+--------
+
+1. install plugin
+
+    ```
+    $ npm install --save growi-commons
+    ```
+
+Documentation
+------------
+
+See https://docs.growi.org/api/commons.html