Add install

[fabriciofx]

Let's create an easy way to install git-work. For example, $ git-work.sh install. I'll handle it.

[mdbs99]

I didn't get it.
IMHO the easiest way to install is add an alias.
Could you explain more why is this important?

[mdbs99]

Now I understood.
Please, could you update README:Installing section in this same PR?

And Installation may be a better section name.

[fabriciofx]

@mdbs99 I think it's important because it's an easier way to install it than execute the git alias command. Besides, I'm using this example to explain to my students how to contribute to an open source project. Say hello to my class! :)

[mdbs99]

WOW! That is nice.
Hello class!

[mdbs99]

@fabriciofx it was merged in f45b6be please, close.

[fabriciofx]

Closed #7.