Add readme

Author: Alexey Simakov

README.md

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+# Usage
+
+How to use `rubyc` tool in docker? 
+https://github.com/pmq20/ruby-packer
+
+### Install docker tool:
+
+https://docs.docker.com/v17.12/install/
+
+Straight link for Ubuntu install:
+
+https://docs.docker.com/v17.12/install/linux/docker-ce/ubuntu/
+
+### Clone it
+
+`git clone git@github.com:iamsimakov/rubyc-usage-example.git`
+
+### Build
+
+`cd rubyc-usage-example && docker build ./`
+
+... will take ~10 mins and near 10GB memory usage
+
+Sample output will finished with lines:
+
+<pre>
+...
+linking ruby
+make[2]: Leaving directory '/tmp/rubyc/ruby-2.4.1-0.4.0'
+make[1]: Leaving directory '/tmp/rubyc/ruby-2.4.1-0.4.0'
+-> cp "ruby" "/usr/src/app/a.out"
+-> cd /usr/src/app
+Removing intermediate container e9fba5750acd
+ ---> 200de23ba865
+Successfully built 200de23ba865
+</pre>
+
+### Run app
+
+`docker run -it 200de23ba865 bash`
+`./a.out`
+or
+`docker run -it 200de23ba865 ./a.out`
+
+Sample output:
+<pre>
+### Search for nodes by css
+### Search for nodes by xpath
+### Or mix and match.
+</pre>
+
+# Recomendations for Rails Apps
+
+Modify Dockerfile as you want to build yor app.
+For example, to build rails change last line to 
+
+`RUN rubyc bin/rails`
+
+More info read: https://github.com/pmq20/ruby-packer
+
+Based on: https://github.com/pmq20/ruby-packer/issues/39#issuecomment-415494119
+