Add contributors instructions for non-technicians

[deshack]

At least in the demo website, we need some info on how to contribute with things like translations.

See #5

[EugenioPetulla]

I take care of this as soon as possible.

[EugenioPetulla]

http://codeat.co/pinit/contribute/

Do you want add anything? @deshack

[deshack]

The text is good, but I would highlight some words to help focus on the different ways to contribute to the project (with bold text):

If you are a developer and want to help us improving this little piece of code please fork it on GitHub, open a issue or a direct pull request if you think it’s a good choice.

We are open to every kind of contribution so if you are a translator and want to give us a feeback or want include a new language for this project you have to know that we use standard .po and .pot languages file formats.

Download the .pot directly from GitHub or push the button on this page and start edit it with Poedit.
Open a GitHub issue or leave us a message using the form below and we will reply as soon as possible.

[EugenioPetulla]

Did it! :)

http://codeat.co/pinit/contribute/

[deshack]

Well done @EugenioPetulla