added dockerfile for development (#377)

Dockerfile

@@ -0,0 +1,41 @@
+# This file is part of the Kimai time-tracking app.
+#
+# For the full copyright and license information, please view the LICENSE
+# file that was distributed with this source code.
+ 
+FROM php:7.2.9-apache-stretch
+
+WORKDIR /opt/kimai
+
+RUN php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer && \
+    apt update && \
+    apt install -y \
+        git \
+        libicu-dev \
+        libjpeg-dev \
+        libldap2-dev \
+        libldb-dev \
+        libpng-dev \
+        unzip \
+        zip \
+        && \
+    docker-php-ext-install \
+        gd \
+        intl \
+        ldap \
+        pdo_mysql \
+        zip && \
+    apt-get -y autoremove && \
+    apt-get clean && \
+    git clone https://github.com/kevinpapst/kimai2.git /opt/kimai && \
+    sed "s/prod/dev/g" .env.dist > .env && \
+    composer install --dev --optimize-autoloader && \
+    bin/console doctrine:database:create && \
+    bin/console doctrine:schema:create && \
+    bin/console doctrine:migrations:version --add --all && \
+    bin/console cache:warmup && \
+    chown -R www-data:www-data var
+
+EXPOSE 8001
+USER www-data
+CMD /opt/kimai/bin/console server:run 0.0.0.0:8001