Update README.md

Author: zaporylie

README.md

@@ -1,21 +1,52 @@
 DRUSH for Drupal
 -----------------------
 
-[![Build Status](https://travis-ci.org/drupal-docker/drush.svg?branch=master)](https://travis-ci.org/drupal-docker/drush)[![](https://badge.imagelayers.io/drupaldocker/drush:latest.svg)](https://imagelayers.io/?images=drupaldocker/drush:latest 'drupaldocker/drush')
+[![Build Status](https://travis-ci.org/drupal-docker/drush.svg?branch=master)](https://travis-ci.org/drupal-docker/drush)
+
+
+Version | Tags | Dockerfile | Layers
+--- | --- | --- | --- | ---
+master | `latest`, `master`, `8` | [Dockerfile](https://github.com/drupal-docker/drush/blob/master/master/Dockerfile) | [![drupaldocker/drush:8](https://badge.imagelayers.io/drupaldocker/drush:8.svg)](https://imagelayers.io/?images=drupaldocker/drush:8)
+7 | `7` | [Dockerfile](https://github.com/drupal-docker/drush/blob/master/7/Dockerfile) | [![drupaldocker/drush:7](https://badge.imagelayers.io/drupaldocker/drush:7.svg)](https://imagelayers.io/?images=drupaldocker/drush:7)
+6 | `6` | [Dockerfile](https://github.com/drupal-docker/drush/blob/master/6/Dockerfile) | [![drupaldocker/drush:6](https://badge.imagelayers.io/drupaldocker/drush:6.svg)](https://imagelayers.io/?images=drupaldocker/drush:6)
 
 # Quickstart:
 
+Interactive shell:
+````
+docker run --rm -ti drupaldocker/drush
+````
+Bash with drush command available:
 ````
-docker run -dP --volume <path/to/drupal>:/var/www/html drupaldocker/drush
+docker run --rm -ti drupaldocker/drush bash
 ````
 
-# Roadmap
-- ~~Add master~~ (thank you @slashrsm)
-- Create folders for major Drush versions, use drupaldocker/php:cli as parent image
-- Add documentation
+# Environmental variables
+
+No variables
+
+# Description
+
+@todo
+
+# Good to know
+
+Drush 6 doesn't have support for `drush core-cli` command. Use:
+````
+$ docker run --rm -ti drupaldocker/drush bash
+/var/www/html# drush st
+/var/www/html# exit
+````
 
 # Status
+
 Proof of concept
 
-# Contribution
-Create a pull request and become project maintainer :)
+# Contributing
+
+1. Fork the repo
+1. Create your feature branch
+1. Commit your changes
+1. Push to the branch
+1. Create new Pull Request
+1. Wait for result of automate tests