Readme.md missing

[manuel-91]

If there is anyone who knows a little what this project is doing please write a few sentences.

• What is this repo doing?
• Why shoud I use this package?

If the archlinux description for microcode describes this well, then a reference might be helpful.

[projach]

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00233.html

[mcu-administrator]

New readme.md format included with microcode-20201110 tag