Create sinatra_reading.md
add basic sinatra example
Merge branch 'master' of https://github.com/tibbon/WDI_Summer_Public
database walkthrough
updated address_book.rb
created psql cheatsheet
git cheatsheet
terminal cheatsheet
clarified basic addressbook file
clarified sql files
added postgresapp setup
sinatra db addressbook
finished basic sinatra
Merge remote-tracking branch 'upstream/master'