Discuss adding a section on how to convert into singularity to be used in the CSF

[fherreazcue]

Pull request #184 to the original carpentry course has content that may be useful.

[OliverWoolland]

A discussion about singularity might let us bring up / suggest strategies around the security issues which Docker can bring (#12)

[OliverWoolland]

I'm not sure this fits any more! I'd propose closing this not planned