Initial addition

@ewels here it is :+1: 

This is WIP repo, so can be merged without a review (for now) :)
Ok, fair enough. I'd kind of thought that we would make manual changes like this in the markdown. It should be pretty easy - after editing the file you can just do `make_reports filename.md` if you have the [bash function](http://ewels.github.io/ngi_reports/usage/#manual-edits) set up..

But I guess if this is a common thing then it doesn't hurt to be able to do it on the command line as well..