Added documentation

Author: castarco

README.md

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+# Jupyter-PHP Installer ([Main Page](https://litipk.github.io/Jupyter-PHP-Installer/))
+
+[![Author](http://img.shields.io/badge/author-@castarco-blue.svg?style=flat-square)](https://twitter.com/castarco)
+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
+[![Packagist Version](https://img.shields.io/packagist/v/Litipk/jupyter-php.svg?style=flat-square)](https://packagist.org/packages/Litipk/jupyter-php)
+
+## Introduction
+
+[**Jupyter-PHP**](https://github.com/Litipk/Jupyter-PHP) is a PHP kernel for [*Jupyter*](http://jupyter.org). This
+repository holds an installer to make easier installing the Jupyter-PHP kernel.
+
+## Getting started
+
+Go to the [main page](https://litipk.github.io/Jupyter-PHP-Installer/) and follow the instructions.
+
+## Learn more
+
+ * [Chat Room](https://gitter.im/Litipk/Jupyter-PHP) : If you want to have a real-time chat with other Jupyter-PHP users or developers, you can do it here.
+ * [Group / Mail List](https://groups.io/g/jupyter-php) : If a chat room isn't enough to post your doubts or ideas, you can join to our mail list.
+
+## How to contribute
+
+ * First of all, you can take a look on the [bugtracker](https://github.com/Litipk/Jupyter-PHP-Installer/issues) and decide if there is something that you want to do :wink: . If you think there are missing improvements in this file, then you are invited to modify the TODO list.
+ * You can also send us bug reports using the same bugtracker.
+ * If you are really interested on helping to improve Litipk\BigNumbers, we recommend to read the [contributing guidelines](https://github.com/Litipk/Jupyter-PHP-Installer/blob/master/CONTRIBUTING.md).
+
+
+## License
+
+Jupyter-PHP and its installer are licensed under the [MIT License](https://github.com/Litipk/Jupyter-PHP-Installer/blob/master/LICENSE).