Created file for configuring git to my preferred options when first using on a new system.

As run, it will set standard parameters:
* user.name "Matthew Ireland"
* user.email "matthew.t.ireland@gmail.com"
* cache github username/password for 100000 seconds
* core.editor emacs
* help.autocorrect 1
* color.ui true

In addition, there are various commented options for
* commit.template
* core.pager
* user.signingkey
* core.excludesfile
* core.autocrlf
* color.*

Uncommenting any of these options will set them to a reasonable default. Read the comments/git documentation for more information on exactly how they should be configured.