Update repo description

[hlung]

My friends keep asking me what this plugin could do. I think they somehow didn't understand the repo description. We should rewrite it a bit and add some more familiar keys to HOME key so new users will have a better grasp of what this plugin can do. Something like this...

"Xcode plugin that makes keys like HOME, ⌘+←, ⌘+del, and ctrl+A stops at the first non-whitespace character."

[insanehunter]

Good call. I think I could make an animated gif to show plugin in action as well.