added credential cacheing

00 Setup.md

@@ -95,3 +95,4 @@ Before you can work with Git you need to update the repository configuration. Fo
 1. Update your name (this must be the name as it appears on your ID badge) using `git config user.name 'Joe Bloggs'`.
 2. Update your email (using your unversity email) `git config user.email 'bloggsj@uni.coventry.ac.uk'`
 3. Update your commandline editor choice using `git config core.editor nano` (the editor must be installed!)
+4. Cache your credential (username/password) for an hour using `git config credential.helper 'cache --timeout=3600'`