Added changelog, contribution requirements and readme badges

Author: paliarush

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+ * [\[Unreleased\]](#unreleased)
+ * [\[v1.0.0\] - 2016-01-11](#v100---2016-01-11)
+
+## [Unreleased]
+
+### Changed
+
+ - Moved provisioning scripts
+ - Magento project directory moved to vagrant project root. Current structure is as follows: `vagrant-magento/magento2ce/magento2ee`
+ - PHP 7.0 is installed by default instead of PHP 5.5.9 (can be configured in [local.config/config.yaml.dist](local.config/config.yaml.dist))
+
+### Added
+
+ - Implemented static value of forwarded SSH port to prevent necessity to reconfigure software accessing guest via SSH
+ - Implemented collision prevention for IP address and host name (in case when several machines are created at once)
+ - Added configuration file [local.config/config.yaml.dist](local.config/config.yaml.dist)
+ - Added PHP 7.0 support
+ - Added PHP Storm configuration during project initialization
+ - Added [project initialization script](init_project.sh) for *nix and OSX hosts 
+ - Added ability to customize repository URLs and Apache config
+
+## [v1.0.0] - 2016-01-11
+
+### Added
+
+ - Integrated vagrant host manager plugin to allow automatic /etc/hosts update 
+ - Added support of EE linked to CE using symlinks on *nix hosts 
+ - Added ${MAGENTO_ROOT} environment variable, which stores installation path on the guest
+ - Added support of Rabbit MQ
+ - Added possibility to specify tokens for repo.magento.com composer repository 
+ - git is now installed on guest machine
+ - Removed 'magento' MySQL user, password of 'root' user removed 
+ - Database for integration tests are created by default 
+ - Added script for clearing Magento cache from host command line 
+ - Configured XDebug to allow remote debugging
+ - Fixed max_nesting_level issue with XDebug enabled  
+ - Apache is run by 'vagrant' user
+ - Enabled Magento cron jobs 
+ - Enabled XDebug by default
+ - Created vagrant configuration for Magneto 2 CE developer's environment installation

CONTRIBUTING.md

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+Everyone is welcome to contribute improvements and fixes to this project. There are no specific requirements, just create a pull request with proposed modifications.

README.md

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 # Vagrant project for Magento 2 developers (optimized for Mac, Windows and \*nix hosts)
 
+[![GitHub release](https://img.shields.io/github/release/paliarush/magento2-vagrant-for-developers.svg)](https://github.com/paliarush/magento2-vagrant-for-developers/releases)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
+[![Semver](http://img.shields.io/SemVer/2.0.0.png)](http://semver.org/spec/v2.0.0.html)
+
  * [What You get](#what-you-get)
  * [How to install](#how-to-install)
    * [Requirements](#requirements)