Convert READMEs to markdown.

GitHub shows markdonwn in nicer way than plain text, but it's still human readable.

See [README.md] and it's [markdown source].

[README.md]:https://github.com/Mkaysi/PGPGLA/blob/readme/README.md
[markdown source]:https://raw.github.com/Mkaysi/PGPGLA/readme/README.md

If you want to sign them, you should use gpg --detach-sign -a README.md, which creates README.asc containing the signature, which can be verified with gpg --verify README.md.asc.

If you don't have it already, you should add "armor" to your gpg.conf so you don't acidentally get binary output and git commit it. Git isn't very good with binary files.