Update wilp12 README with checksum when available

[brs17]

Also update checksum and bios version info when customized bios becomes available.

[amancevice]

Ditto for meer2

[brs17]

@amancevice checksum for meer2 has already been added!

[amancevice]

Oh nice, it was not where the person I spoke to on the phone said it would be so I missed it. Thanks for pointing it out.

[brs17]

Yes, thanks for bringing it up!

[amancevice]

Do you know if there is a way to confirm that the BIOS update worked? My checksum matches but I want to compare the BIOS version I see when I run sudo dmidecode -s bios-version

[brs17]

Should be posted now towards the bottom of the instructions.