Add SIH modules

[georgiesamaha]

Add subdirectories in modules/ for SIH and local so we can import shared modules i.e. input checker.

[georgiesamaha]

How would we import shared modules? Possible to do this manually, but is there a way for us to automate/streamline this process (write a little cli tool?) like nf-core has done without the complexity? Probably best to just import the module .nf files from a modules repo, connect channels etc manually.