Fixed dockerfile, add docs

Author: meron1122

README.md

@@ -150,6 +150,10 @@ Run `docker-compose up -d` instead.
 
 * Permission problem? See [this doc (Setting up Permission)](http://symfony.com/doc/current/book/installation.html#checking-symfony-application-configuration-and-setup)
 
+* How to config Xdebug?
+Xdebug is configured out of the box!
+Just config your IDE to connect port  `9001` and id key `PHPSTORM`
+
 ## Contributing
 
 First of all, **thank you** for contributing ♥  

php7-fpm/Dockerfile

@@ -20,16 +20,17 @@ RUN "date"
 RUN docker-php-ext-install pdo pdo_mysql
 
 
-# Install and config xdebug ( From:https://hub.docker.com/r/inblank/php7-xdebug/~/dockerfile/ )
-RUN pecl install xdebug \
-    && docker-php-ext-enable xdebug \
-    && echo "error_reporting = E_ALL" > /usr/local/etc/php/php.ini \
-    && echo "display_startup_errors = On" >> /usr/local/etc/php/php.ini \
-    && echo "display_errors = On" >> /usr/local/etc/php/php.ini \
-    && echo "xdebug.remote_enable=1" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
-    && echo "xdebug.remote_connect_back=1" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
-    && echo "xdebug.idekey=\"PHPSTORM\"" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
-    && echo "xdebug.remote_port=9000" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+# install xdebug
+RUN pecl install xdebug
+RUN docker-php-ext-enable xdebug
+RUN echo "error_reporting = E_ALL" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+RUN echo "display_startup_errors = On" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+RUN echo "display_errors = On" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+RUN echo "xdebug.remote_enable=1" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+RUN echo "xdebug.remote_connect_back=1" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+RUN echo "xdebug.idekey=\"PHPSTORM\"" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+RUN echo "xdebug.remote_port=9001" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+
 
 RUN echo 'alias sf="php app/console"' >> ~/.bashrc
 RUN echo 'alias sf3="php bin/console"' >> ~/.bashrc