Create getting started chapter

[rjoleary]

Here are some thoughts:

• A version of the getting started guide using qemu.
• A version of the getting started guide using hardware. Exactly which piece of hardware this would be is undecided, but the requirements are:
  • cheap
  • easy to buy and ship online
  • has a reasonably sized flash chip
  • has a programming header and is easy to reflash
• An accompanying presentation which follows the same format for use in workshops and on-boarding.

[orangecms]

As of now, https://github.com/u-root/u-root#usage is quite detailed about a quickstart with QEMU. We could very much copy that I think.
Regarding hardware: Since Heads (also an implementation of the LinuxBoot concept) already supports the X230 quite well, I'd propose that one for now (12MB flash) and running on top of coreboot. For running on top of a given UEFI PEI stage, we'd need to have details on utk and the whole DXE cleaning matter as well, so that would be harder for just getting started. Does that make sense?