Add new module System Calls

[ConnorNelson]

Let's not merge it quite yet. Just wanted to make the progress public.

Of course this is just 1 series of (7) challenges. We have a lot more to explore from here.

I figure we get very good exposure to:

• strace
• arguments of read syscall including dedicated focus on fds, memory, and the size argument.
• we get to understand that fd is the return value of open, which is going to be used later
• we get to understand that memory is contiguous, and we can read into that contiguous memory in an overlapping way, which overwrites previous memory there

[ConnorNelson]

Also, this is just full on yolo typed, not compiled or tested at all (but I only write working code).