[Halld-klf-physics] [EXTERNAL] KL Generator fork instructions

[Stuart Fegan]

Hi Everyone,

I've added a panel describing the use of my forked generator with custom 
beam profiles to the KLF Simulations wiki page, in the "Generating 
Events" section. This is just a temporary measure until the fork is 
folded into the generator proper, please report any bugs or problems in 
your use cases and we can try to figure them out.

Cheers,

Stuart