Add basic nginx config instructions

Add some basic nginx config instructions. Wouldn't hurt to have more detail, but this should be enough to get someone going on nginx and able to tweak it as they need.
Consistent use of passphrase over password, and clarifying that no keying material is held on disk
Merge branch 'master' of https://github.com/atoponce/d-note
Consistent use of passphrase, and some typo
Merge pull request #20 from vimalloc/patch-1

Add basic nginx config instructions
add new prerequisite for installation
Merge branch 'master' of https://github.com/atoponce/d-note
Merge pull request #27 from burntout/master

Fix some minor typo, and clarify that no keying material is held persistently on server