Added Dockerfile i used for creating custom docker image for Bitbucket

Pipelines Beta.

--HG--
branch : develop

dist/docker/Dockerfile

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+FROM gcc
+MAINTAINER Roman Telezhynskyi <dismine@gmail.com>
+
+RUN apt-get update && apt-get install -y \
+    cppcheck \
+    locales \
+    xvfb \
+    qtbase5-dev \
+    libqt5svg5-dev \
+    qt5-default \
+    qttools5-dev-tools \
+    libqt5xmlpatterns5-dev \
+    libqt5core5a \
+    libqt5gui5 \
+    libqt5printsupport5 \
+    libqt5svg5 \
+    libqt5widgets5 \
+    libqt5xml5 \
+    libqt5xmlpatterns5 \
+    xpdf \
+    && rm -rf /var/lib/apt/lists/*
+
+# Whatever you need more than what is on the base image required by your project
+ 
+# Set the locale
+RUN dpkg-reconfigure locales && \
+    locale-gen en_US.UTF-8
+
+ENV LANG en_US.UTF-8  
+ENV LANGUAGE en_US:en  
+ENV LC_ALL en_US.UTF-8

dist/docker/README

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+There are some steps required to create your own docker image.
+
+1. Have a Docker hub account, https://hub.docker.com/
+2. Install docker.io package on 64 bit system. 
+3. Create a Dockerfile. You will find one in this directory.
+4. Build the image from Dockerfile.
+5. Push the image to Docker hub.
+6. Specify the image in your bitbucket-pipelines.yml file
+
+1 Docker hub account
+Well, sign up here =) https://hub.docker.com/
+
+2 Install docker
+sudo apt-get install docker.io
+
+3 Create Dockerfile
+Find example in this directory.
+
+4 Build docker image
+In the same directory as you have your Dockerfile, run command:
+docker build -t yourdockerusername/imagename .
+
+5 Push image to Docker hub
+Run command
+docker push yourdockerusername/imagename
+
+6 Specify the image in your bitbucket-pipelines.yml file
+As documented here: https://confluence.atlassian.com/display/BITBUCKET/Use+Docker+images+as+build+environments+in+Bitbucket+Pipelines
+
+You can use your image on a top level as well as on a specific step like this. 
+image: yourdockerusername/imagename