Put border around note title. Add to README and .gitignore

[misjoinder]

• Adds a border around note title, better separating title and content
• Don't track .DS_Store metadata on Macs
• README spelling fix

[abeluck]

Thanks for the contribution! This patch doesn't cleanly apply because of changes in master, could you please rebase your patch onto it and repush?

[misjoinder]

Updated from master branch

[abeluck]

Thanks! Will review and merge shortly.

[abeluck]

Looks like app/res/layout/note_edit.xml didn't merge correctly with master.. there's some diff remnants in there, I can't merge it as is.

I tried comparing your changes to the current note_edit.xml, but it's changed a bit.