Initial commit: Added Dockerfile and README for Cell Ranger software

[jaamarks]

Initial commit for Cell Ranger software tool: https://www.10xgenomics.com/support/software/cell-ranger

We did not include the human genome reference since it would make the docker image over 32GB.

[jaamarks]

A few comments, do you typically try and build the docker before approving it? Or do you just trust that the developer has done this prior to submitting the pull request?

Whoever is reviewing it should try to build the docker image before approving it. This brings up a good point though, maybe we should add a short section on Reviewing a PR to our https://github.com/jaamarks/biocloud_docker_tools/tree/master#dockerfile-best-practices-checklist

I'm thinking:

• Review code: Check for syntax errors, coding standards, and best practices.
• Review Documentation: Ensure that comments and READMEs are clear and informative.
• Approve: Verify that the Dockerfile builds locally. Then approve for merging.

[jaamarks]

@jkstratford, thanks for the review. I believe I have addressed all of your comments. @rmathur87, would appreciate a quick review if you have time also.